Answer:
Four great mass extinctions.
Explanation:
Phanerozoic era is a period of time that occured in over 542 millon years. It is an era in geological history that can be divided into 3 eras.
a. Paleozic era: This era occured between 542 to 251 million years ago
b. Mesozoic era: This era occured between 251 to 65 million years ago
c. Cenozoic era:This era pictures between 65 millon years ago till this present day.
There has been been four great mass extinctions over the past 500 million years that claimed 40 percent or more of these genera during the Phanerozoic era and they are:
a. Ordovician Mass Extinction
b. Devonian Mass Extinction
c. Permian Mass Extinction.
d. Cretaceous-Tertiary (or the K-T) Mass Extinction.
A zygote is the first cell that results when an egg is fertilized by a sperm.
I hope this helps.
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.