Possession of flagellum is not a taxonomic feature. many different unrelated organisms have flagellum. euglena, zooflagellates but also some fungi or even human sperm cells.
Answer: I believe it was the Cenozoic period
Explanation:
I would go on on the first option, population, community, ecosystem. If there is a control on the rapid growth of population, surely, pollution in the whole community will be reduced thus, making the ecosystem well balanced.
Crossing over in germinal cells during gametogenesis is one of the primary causes of this variance. In humans, gametes are generated during meiosis, which reduces the chromosome number to 23.
One cell divides twice during meiosis to create four daughter cells. These four daughter cells are haploid, meaning they have half the amount of chromosomes as the parent cell. Meiosis generates sex cells or gametes? (eggs in females and sperm in males).
During meiosis, homologous chromosomes are paired, resulting in gene recombination.
Non-sister chromatids exchange genetic material, resulting in novel allele combinations.
Learn more about to meiosis visit here;
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