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There are 7 criteria for an organism to be considered alive:
(a) Homeostasis: Regulation of the internal environment to
maintain a constant state
(b) Organization: Being composed of one or more cells, which are the basic units of life.
(c) Metabolism: Consumption of energy by converting nonliving material into cellular components (anabolism) and
decomposing organic matter (catabolism). Living things
require energy to maintain internal organization (homeostasis) and to produce the other phenomena
associated with life.
(d) Growth: Maintenance of a higher rate of synthesis than
catalysis. A growing organism increases in size in all of its
parts, rather than simply accumulating matter. The particular
species begins to multiply and expand as the evolution
continues to flourish.
(e) Adaptation: The ability to change over a period of time in
response to the environment. This ability is fundamental to
the process of evolution and is determined by the
organism's heredity as well as the composition of
metabolized substances, and external factors present.
(f) Response to stimuli: A response can take many forms, from the contraction of a unicellular organism when touched to complex reactions involving all the senses of higher
animals. A response is often expressed by motion, for
example, the leaves of a plant turning toward the sun or an
animal chasing its prey.
(g) Reproduction: The ability to produce new organisms.
Reproduction can be the division of one cell to form two new
cells. Usually the term is applied to the production of a new
individual (either asexually, from a single parent organism,
or sexually, from at least two differing parent organisms),
although strictly speaking it also describes the production of
new cells in the process of growth.
Because of these factors, cells are alive.
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What happens to the cells that enter the G0 stage?
The cells are alive and metabolically active.
Unlike Hooke Leewenhoek observed cells that?
found cells that were alive
Are guard cells alive or dead?
Alive
Which characteristics must an object possess in order to be considered alive?
According to the cell theory; for an object to be considered alive, it must be made of cells and cell products.Source- Mcdougall Littel 10th grade Biology TextbookAny object that is an organic object is considered to be alive.
Are bones dry and dead?
No, if the animal is alive, then the bones are alive. Inside the bones are marrow, which produce new red blood cells. If you fracture a bone, then splint the bone. The cells will grow back together and heal.
What is the smallest thing that can be considered alive?
A Cell
What living things do not have cells?
Some believe that viruses are alive, yet they do not have their own cells. They usually 'borrow' a cell's energy producing mechanism, the mitochondria. If they were not considered alive, then there would be nothing alive that does not have cells.
Are tumors alive?
Tumors consist of living cells but they are not considered their own organisms.
If fire is considered alive then why are flowers considered alive?
fire is considered alive because it needs oxygen to burn. flowers are alive because it needs heat for energy to create more cells, CO2 because they need it to produce necessary sugars. and it grows... of course
What are cells so they can work together to keep an organism alive?
Cells that work together are called tissues. Blood is considered a tissue.
Are blood and onion cells filled with living material or are they empty?
They are both filled with living material.
Are phloem cells alive?
Yes, Phloem cells are alive.
What happens to the cells that enter the G0 stage?
The cells are alive and metabolically active.
Are cells of the stratum granulosum alive?
the superficial cells of stratum granulosum are dead,but the deeper cells are alive.
Are cells organisms?
If it is alive then it is an oganism. You just need to know if it's alive. Anythin' that is living is an organism. depends on the cell and the level of organization: bacterial cells are considered organisms liver cells are not organisms read up on cell theory (not the marxist kind) that should clarify the definition of organisms for you.
Unlike Hooke Leewenhoek observed cells that?
found cells that were alive
Are guard cells alive or dead?
Alive
