Science

The 1A super giants on the Hertzsprung-Russell diagram.

In science, "normal" typically means something that is within expected parameters or conforms to a standard. For example, a "normal distribution" refers to a bell-shaped curve that represents the expected distribution of a set of data points.

Animal cell:

Nucleus(except for red blood cell,etc)

Cell Membrane

Cytoplasm

numerous tiny vacuoles

More:

lysomes,flagellum(tail like thing in sperms).rough endoplasmic reticulum(RER)

smooth endplasmic reticulum(SER), ribosomes

Plant Cell:

+cell wall

+chloroplasts

+ large central vacuole

- numerous tiny vacuoles

-flagellum

The sun appears yellow because of the Earth's atmosphere scattering sunlight, which makes it appear reddish-yellow. In reality, the sun emits light across the entire visible spectrum, but shorter wavelengths (blue and violet) are scattered more by the atmosphere, leaving yellow and red light to reach our eyes.

A cow can defecate up to 15 times a day. Normally, a cow will defecate around 10 times a day.

The temperature of outer space is measured in Degrees Kelvin. The Kelvin scale starts at what is called Absolute Zero, and is based on the theory of a "Perfect Vaccuum" (a vaccuum in which no matter exists whatsoever). Space, however, is not a perfect vaccuum. There are various gasses and other particles floating around in it, and for that reason its temperature cannot possibly be Absolute Zero. It would depend on exactly how much matter is present in any given region of space as to that regions temperature in Degrees Kelvin. It is scientifically acceptable to determine the temperature of space to be "fractionally above Absolute Zero", as its (space, as a whole) temperature varies from region to region. How the temperature in space is physically measured is another question, and one I cannot answer.

The tides are an effect on the moon as well as the sun's gravitational pull. For example, when the moon and sun are on different sides of the Earth (which happens about twice a month), the high and low tides' difference in height are greatest, because there are two gravitational pulls acting on each other. When there is a half moon (sun and moon forming a right angle with Earth), the difference in height is not as great because the pulls are not opposite. So as the moon orbits around Earth, it pulls the ocean waters with it. As the Earth orbits the sun, the sun also pulls the ocean waters, as the sun basically pulls anything on this planet.

Combustible material (such as paper or wood) and a source of heat (such as a match or spark) can react to create fire. The heat ignites the combustible material, leading to combustion and the release of heat and light.

The Canadarm was designed, developed, and tested by SPAR Aerospace of Canada. SPAR has facilities in Trenton Ontario, Mississauga Ontario and Venice, Italy. The Canadarm2 was developed by MDA which stands for MacDonald Dettwiler Robotics. There were originally 5 Canadarms, but 2 were lost in the Challenger and the Columbia disasters. There is only one Canadarm2, and that is on the ISS (international space station) module called Destiny. Hope this helps you!

The prostomium is the first body segment in an earthworm which is part of a group of worms called segmented worms or annelids. The prostomium does not include the worm's mouth. -Anonymous

Humans have landed on the Moon, specifically during the Apollo missions conducted by NASA in the late 1960s and early 1970s. To date, the Moon is the only celestial body beyond Earth's orbit that humans have physically landed on.

The mew cat sound rhymes with chew. Rather than calling it a meow, some people call the noise that a cat noise sounds like mew.

Water and carbon dioxide can be removed from the air using a pre-treatment process like dehydration and scrubbing. Dehydration removes water using adsorption or cooling techniques, while scrubbing involves passing the air through a solvent to absorb carbon dioxide. These steps help ensure that only the desired compounds enter the fractionating column.

An alligator's head is typically broad and rounded with a long snout. They have large, powerful jaws that contain many sharp teeth for capturing and eating prey. The eyes and nostrils are situated on top of the head, allowing them to see and breathe while mostly submerged in water.

Radium is typically separated from other materials found with it using chemical processes, such as solvent extraction or ion exchange chromatography. These methods exploit the chemical properties of radium to selectively separate it from other elements. Once separated, radium can be further purified through methods such as precipitation or distillation.

The air pressure decreases at night. This rising air creates a warm low on the ocean's surface. Cool air collects on the surface, forming a high pressure area. Due to a loss of heat, a low pressure forms above the land. A high pressure zone forms as the cooler land further cools the air just above the land. Winds that are aloft move from ocean to land. The surface winds will flow from high to low pressure and create a land breeze.

Alchemists just tried to transmute substances into gold. Their only interest was getting rich quick.

The field of medicine was made with the goal of saving lives of sick and injured people. Chemistry is a science which can be used to learn about chemicals and create all sorts of useful substances. Basically, chemistry and medicine are for the bettering of humanity, while alchemy is the self-centered pursuit of wealth.

A convexo-concave lens is a lens that has one side convex (outward bulging) and the other side concave (inward curving). This type of lens can be used to correct myopia (nearsightedness) by diverging light rays entering the eye.

I should imagine that NO planet is actually seen in any constellation, certainly not with the naked eye and even the most powerful earth and orbital telescopes can't see planets outside our own solar system. The constellation you refer, Big Dipper, aka Ursa Major or "The Great Bear." In the United Kingdom the constellation is referred to as "The Plough" because of it's resemblance to an old fashioned farming tool. The list of constellation star name, distances and magnitude (apparent brightness as measured by an earth observer) Name Apparent Magnitude Distance (L Yrs) Dubhe 1.8 124 Alkaid 1.9 101 Merak 2.4 79 Phecda 2.4 84 Megrez 3.3 81 Alioth 1.8 81 Mizar 2.1 78

A human cheek cell typically contains squamous epithelial cells that line the inside of the mouth. These cells are flat and provide protection to the underlying tissues. Additionally, there may be some white blood cells present in the cheek cell sample.

Mars does have an atmosphere, although it is extremely thin. 95.32% (by mole fraction or volume) of the atmosphere is carbon dioxide. The rest of the atmosphere is made up of nitrogen (2.7%), argon (1.6%), oxygen (0.13%), carbon monoxide (0.07%), water vapor (0.03%) and nitric oxide (0.013%). There are also traces of a few other gases such as neon (2.5 μmol/mol), krypton (300 nmol/mol), formaldehyde (130 nmol/mol), xenon (80 nmol/mol), ozone (30 nmol/mol) and methane (10.5 nmol/mol).

As noted, the atmosphere is very thin. The atmospheric pressure on the surface of Mars varies from around 30 pascals (0.0044 psi) on Olympus Mons's peak to over 1,155 pascals (0.1675 psi) in the depths of Hellas Planitia, with a mean surface level pressure of 600 pascals (0.087 psi), compared to Earth's sea level average of 101.3 kilopascals, i.e. 101,300 pascals.

Approximately 109 times the number of venues on Earth could fit across the diameter of the sun. The sun's diameter is about 1.4 million km, while the average venue size on Earth is around 100 meters.

The branch of knowledge about the universe is called cosmology. It seeks to understand the origin, evolution, and eventual fate of the universe as a whole, including its physical properties, dynamics, and overall structure. Cosmology often involves theories from physics, astronomy, and astrophysics to explore the nature and behavior of the universe on the largest scales.