Answer: A
A hypothesis requires your thinking and some background research to prove your thinking. If you do not do background research, then your thinking will not have backup research.
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Answer:
Light ray coming inside the human eye refracts four times,
the first refraction takes place in cornea, secondly it takes place in aqueous humor, followed by refraction in lens and then in vitreous humor.
Answer:Skeletal, cardiac and smooth
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Homologous structures are organisms which are grouped according to phylogeny, reveal that closely related organisms have more similar structures for example whales were once classified as a fish because they live in the water and they have flippers. Flippers are homologous to human arms and legs and they are therefore closely related to human beings.
Similar embryological development. Embryos of various vertebrates all look similar, including features. For example, tails which are not seen in the maturity suggests that all organisms evolved from a common ancestor, still, we express and share genes that are shared and belie ancestry.
Shared biochemical molecules such as DNA and ATP structure of molecules reflect descent with modification. The evidence of universal common ancestor is being reflected in the universality of DNA as a genetic material.
The genetic code in the machinery of DNA expression and replication. The relatedness within groups of organisms is reflected in the similarity in their DNA sequences. This is the exact pattern to be expected from diversification and descent from a common ancestor.
