Sister chromatids are two identical copies of Chromosome that is formed by the replication of a single chromosome.
This copies are formed during mitosis. Later on, these two sisters chromatids will grown into two different Cells
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Answer: The main cause of the extinctions is the destruction of natural habitats by human activities, such as cutting down forests and converting land into fields for farming. Due to human activities, populations of many species have become small and isolated.
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The lungs are the organs most affected by coronavirus
Los pulmones son los órganos más afectados por coronavirus
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- Individuals are variable.
- Some variations are passed down.
- More offspring are produced than can survive;
- Survival and reproduction are not random.
- The history of earth is long.
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