Prokaryotic cells are entire organisms since they only have one cell. They have no cell membrane and no membranes around organelles. Unlike them, eukaryotic cells have this and construct complex multi-cellular organisms.
A contractile vacuole regulates water in some protozoans.
1.true 2.false 3.the diffusion of water across a membrane 4.Rr
Answer: The correct answer is hormone
Explanation:
A hormone is a chemical substance produced by an organ (usually called gland) and on production is released directly into the bloodstream to be transported to another part of the body (usually called target organ) where its exert its function.
An example of hormone is thyroxine, it is produced by the thyroid gland in the neck and exert function on almost all cells of the body
Answer:
By releasing the oxygen during the photosynthesis, and releasing the CO2 during the cellular respiration
Explanation:
The balance of gases in the atmosphere must be maintained.
Photosynthesis is a process performed by the plants (also some algae and bacteria) in which the energy of sunlight is transformed into chemical energy usable by those plants. Necessary components of this set of reactions are sunlight, water and CO2, while resulting products are glucose and oxygen. Products of photosynthesis are then used in the metabolic processes known as cellular respiration. During the cellular respiration, glucose and oxygen are used for the production of ATP, CO2 and water. Cellular respiration is performed in all living organisms.