What is the purpose of cell division?
A Growth of new cells
B Replacement of older, worn out cells
Used for reproduction
D
All of the above
Answer: All of the above.
TrueFalse
Answer:
Option A, most closely related to mammals
Explanation:
Insects like arthropods and molluscs have an open circulatory system and thus do have a distinguishable heart. Fish has two chambered heart. Reptiles have three chambered heart. Amphibians too have a three chambered heart.
All mammals and fish have four chambered heart. The right and left sides of the chambers have restricted entry and hence remain intact from each other
Hence, option A is correct
The answer is natural selection.
Natural selection is the differences in survival and reproduction as the consequence of differences in phenotypes. According to Darwin's theory of evolution, natural selection is the only factor that affects a frequency of different variations and it is the only mechanism of evolution. In natural selection, genotype variations that will increase the chance of survival and reproduction of some organism are preserved and will be inherited. Darwin's theory suggested that there are variations among individuals in a population and that these variations will help individuals to survive.
The answer to the question is in fact Natural Selection
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B. 46, 23 pairs
C. 90, 45 pairs
D. 140, 70 pairs