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Science

The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.

203,801 Questions

Which would be reduced as a result of the development of pest-resistant crops?

The need for synthetic pesticides would be reduced because the crops themselves would be able to resist pests without the use of chemical interventions. This would lead to lower levels of pesticide residues in the environment and in food.

The basic items that make up our historical record are limited because?

historical records are often biased, incomplete, or lost over time due to factors such as natural disasters, war, and neglect. Additionally, ancient civilizations primarily used perishable materials like papyrus or clay tablets, which deteriorate easily. This leads to gaps in our understanding of history, as some events may not have been recorded or have not survived to the present day.

Describe the differences in the ways the sand castle is changed by an ocean wave and by Dylan stomping on it?

An ocean wave erodes the sand castle gradually over time, smoothing out edges and reshaping it. Dylan stomping on the sand castle causes immediate destruction, breaking it apart and altering its shape abruptly.

List and explain 3 things that every organism needs to survive?

  1. Water: All organisms require water for various cellular processes, as it provides a medium for chemical reactions to occur and helps maintain cell structure and function.
  2. Nutrients: Organisms need nutrients such as carbohydrates, proteins, fats, vitamins, and minerals to obtain energy, support growth, repair tissues, and carry out metabolic activities.
  3. Oxygen: Many organisms require oxygen for aerobic respiration, which is the process that produces ATP, the energy currency of cells. Oxygen is essential for extracting energy from nutrients to fuel cellular processes.

Granite will last a long time when it is used for building in what type of climate?

Granite is a durable material that can withstand various climates but performs particularly well in a cold or temperate climate. Its resistance to extreme temperatures, moisture, and weathering make it a popular choice for building exteriors in these climates.

What is the lining of the blood passing out of the vagina?

The lining of the blood passing out of the vagina is known as a woman's monthly period. It is natures way to strip the old lining of the Uterus that failed to be needed on the woman becomes pregnant. The lining is rebuilt (renewed) to prepare for a possibly future pregnancy.

How do organs complex organisms organized?

There are a number of ways in which organims can become more complex over generations, but the easiest method to convey and understand is through symbiosis..

On the single-cell level, there are two basic divisions known as "domains". One being called, "prokaryotes", and the other being "Eukaryotes. Eukaryotes are distinctively more complex due to the fact that they contain organelles and a nucleus containing it's DNA, whereas, prokaryotes simply have dna floating throughout their cell. It is thought that eukaryotes developed from multiple prokaryotes living symbiotically until, eventually, some prokaryotes began to live their entire lives inside other ones. This explains why mitochondria inside your own cells have their own DNA separate from the DNA in the nucleus (Apparently, at one time, they were independent organisms which found an advantage in the protection provided by your cells membrane while your cells found an advantage in the abundance of energy that the mitochondria provided).

Multicellular life appears to have developed from multiple eukaryotes grouping together colonially (as in the case of chlorella vulgaris, which became multicellular in a predatory environment under laboratory conditions). As later generations become more reliant on one-another, certain cells become better adapted to specific tasks involved in promoting the overall fitness of the body of cells. This results, eventually, in some cells becoming specialized tissues that, in turn combine to form the specialized structures we call "organs".

The perfect example of all of this is your own body which is literally a walking fortress of creatures that have become symbiotic with all of your specialized tissues which, themselves, have diversified into separate structures over a long series of generations. There are actually more bacteria living in your body performing specialized tasks than there are human cells. If those bacteria weren't there you couldn't digest food or process nutrients. Similarly, those prokariotic bacteria couldn't live without your body.

I'm sure there's someone else who would be glad to explain the genetics, mutations, and the selection mechanisms behind all of the above, but my intent was to keep it as simple as I could.

Basaltic rocks contain approximately 45 percent to 52 percent silica. About how many kilograms of silica would you predict to be in a 68- kg boulder of basalt?

In a 68-kg boulder of basalt with 45-52% silica content, we would expect there to be approximately 30.6-35.36 kg of silica present (68 kg * 0.45 = 30.6 kg and 68 kg * 0.52 = 35.36 kg).

Ask us anythingWhich is a reason that many organisms that have existed on Earth have left no fossils?

Many organisms that have existed on Earth have left no fossils because their remains may have not been preserved due to conditions that are not conducive to fossilization, such as acidic environments that dissolve bones. Additionally, some organisms may have been too small or had soft bodies that are less likely to fossilize. Lastly, fossilization processes are rare events and not all organisms are fossilized.

An igneous intrusive feature that forms from a lens-shaped mass of magma that arches the overlying strata upward is called a?

laccolith. It is a type of intrusive igneous rock formation that creates a dome-shaped bulge in the Earth's crust as magma pushes up the overlying rock layers.

What is the noble gas notation of beryllium?

There are two possible 'noble gas' configurations:

  • 2 8 18 32 18 8 for Bi3-, or in shorthand configuration [Xe] 4f14, 5d10, 6s2 6p6

    and

  • 2 8 18 32 18 0 for Bi5+, or in shorthand configuration [Xe] 4f14, 5d10, 6s0 6p0

Bismuth (as metaloid atom) in elemental notation: [Xe] 4f14, 5d10, 6s2 6p3

An example of homoplastic structures is the wing of a butterfly and?

the wing of a bird. Both wings serve the same function of flight but are made of different materials and evolved separately in each species.

Information that specifies an organism's traits is encoded in genes or pieces of DNA that are located in the organism's chromosomes. The passage of these instructions from one generation to the next g?

The passage of genetic information from one generation to the next is facilitated through processes such as reproduction, where genetic material is passed from parent to offspring. Genes contain the instructions for specific traits that are inherited by offspring, allowing for the continuation of these traits in successive generations. This transfer of genetic information through chromosomes ensures the consistency of traits within a species over time.

Asexual organisms as compared to sexual organisms tend to be smaller have shorter life spans and produce little or no genetic variability between generations. This makes it harder for an individual as?

Asexual organisms reproduce through cloning, resulting in genetically identical offspring, which limits genetic diversity. This lack of genetic variability can be detrimental when facing environmental changes or new challenges because there are no variations for natural selection to act upon. In sexual reproduction, genetic recombination through meiosis creates diversity, allowing for adaptation and evolution.

Some organisms are descended from only one parent. What is the name for this type of reproduction?

Asexual reproduction. This type of reproduction involves only one parent and offspring are genetically identical to the parent.

During DNA replication a primer attaches to a template strand of DNA and begins a new strand. After the primer has attached an enzyme extends the new strand of DNA by adding nucleotides that correspon?

The enzyme responsible for extending the new DNA strand by adding nucleotides is DNA polymerase. It reads the template strand and adds complementary nucleotides to form a new DNA strand. DNA polymerase can only add nucleotides in the 5' to 3' direction.

What is the hypothesis that continents have moved slowly away from there current locations?

It was called "Continental Drift" and was promptly (and rightly) dismissed as it proposed that the Continents were somehow plowing through the solid rock of the Oceanic crust, like ships through the liquid water of the ocean.

It took observations made by the US Navy during the 1950s (and kept classified secrets for many years), including volcanic activity of the midocean ridges, magnetic reversals in the Oceanic crust that were symmetric about the midocean ridges, and very deep ocean trenches. These showed that large moving plates existed in the earth's crust that transported both the Continents and sections of Oceanic crust in various directions.

Ultimately this provided a workable mechanism that replaced the rejected "Continental Drift" hypothesis with the Theory of Plate Tectonics.

After the process of occurs each daughter cell receives an exact copy of the parent cell's DNA.?

The process you are referring to is cell division, where a parent cell divides to produce two daughter cells. During this process, each daughter cell receives a complete copy of the parent cell's DNA through the replication and segregation of chromosomes to ensure genetic continuity.

What eats an wheat plants?

Many different animals eat wheat plants, including insects such as aphids and cutworms, as well as larger animals like birds and rodents. In agricultural settings, wheat plants are also susceptible to damage from pests like rabbits and deer. Farmers may use various methods to control these pests and protect their wheat crops.

Which unit of organism evolves and individual a population or a species?

Evolution occurs at the population level, not at the level of an individual organism or a species. Changes in gene frequencies within a population over time drive the process of evolution.

What is basal drag force?

Basal drag force is the resistance on a glacier's base as it moves over its bed. It occurs due to the friction between the glacier and the underlying rock or sediment. The amount of basal drag force can affect the speed and movement of the glacier.

Why is there little seasonal difference in albedo in the tropics and across most of the southern hemisphere but greater seasonal differences in albedo north of 40 degrees N?

There is less seasonal difference in albedo in the tropics and southern hemisphere because these regions receive consistent sunlight throughout the year due to their proximity to the equator. In contrast, regions north of 40 degrees N experience greater seasonal differences in albedo due to the tilt of the Earth's axis, leading to more variation in sunlight exposure throughout the year.

What are obstacles sperm face on the quest for a viable egg?

Sperm face obstacles such as acidic vaginal pH, barriers within the female reproductive tract, and competition from other sperm. Additionally, a sperm must navigate through various cervical mucus types and physical obstacles to reach the egg for fertilization.