3 years ago

When huge numbers of species die out in a short period of time, it's known as a mass extinction.

1 answer:

4 0

True. When huge numbers of a species die over a short period of time, the term, mass extinction, is used to describe this.

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A new organism begins to form when egg and sperm cells join in the process called fertilization

Irina18 [472]

Yes, when the egg and a sperm cell meet fertilization has taken place

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3 years ago

How “Competition in an ecosystem” is playing a role in life?

marysya [2.9K]

competition plays a very important role in ecology and evolution. The best competitors are the ones who survive and get to pass on their genes.

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2 years ago

3. What is crossing over? When does it occur during meiosis? Why did you have difficulty modeling this element of meiosis using

FrozenT [24]

Crossing over happens in Meiosis 1 only. In Prophase 1 a cells chromatin (chromatin = chromosomes that have not condensed yet) condense and pair up forming homologous chromosomes (paired = XX (2 chromosomes together)). When this happens segments/ alleles of the chromosomes pairing up swap over. This creates genetic diversity as each chromosome is different, it has parts from its pair. This leaves every chromosome unique and individual.

I hope this helps, sorry some of the vocab is rather technical. By the way I would suggest watching the 'Crash Course: Meiosis' on YouTube, this really helped me when I was learning this topic. :D