Answer:
A. S phase
Explanation:
The cell cycle involves all the series of division events that occurs to an organism. Cell division, which can be meiosis or mitosis, involves two main stages viz: Interphase and M phase.
Interphase describes the resting stage of the cell i.e. when the cell is not dividing. The cell uses this time to prepare itself for the next round of division. Interphase stage further consists of three main phases viz: G1, S and G2 phases.
In the S phase or synthesis phase of Interphase, the cell duplicates its genetic material (DNA). Hence, an onion cell observed by a student to have loosely coiled chromatin depicting DNA duplication is in the S-PHASE.
Easy. Answer is oxygen because it says which one was missing before any life was on earth. And in order to have life on earth you need oxygen!
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This is the case since earthquakes form directly from tectonic plates. It happens when 2 tectonic plates pass by each other and causes fiction from the bumby sides of the plates
Answer:
From the time of origin of life on earth has chaged many ways. The earth has also changed from the time of its origin. Both lives on earth itself are dynamic.
Different geolgical phenomena such as volcanic erruptions, tectonic movement etc., have changed the configurations of continents. These changed environment of the continents have affected the lives on the earth.
The Earth is 4.8 billion years old, while the origin of life on the earth is 3.5 billion years old. Gradually these changes have given the chaces of variations, from which the suitable organisms are selected on the earth.
Explanation:
