So many new species were being discovered, it was impossible to arrange them all in a hierarchy based on relative complexity of species.
Answer:
Humans are now responsible for causing changes in the environment that hurt animals and plant species. We take up more space on earth for our homes and cities. Human activity often changes or destroys the habitats that plants and animals need to survive.
Explanation:
Answer: Option A.
Charles Darwin proposed the theory of natural selection as a mechanism of evolution.
Explanation:
Charles Darwin was an English naturalist that lived between 1809 and 1882. He proposed a theory of evolution and natural selection. The theory states that all living organisms came from and develop through the natural selection of small, inherited variation that increase individual's ability to compete, survive and reproduce.
Birds like to lay fossils. Salamanders have tails btw.
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Answer: the size various molecules or fragments of DNA
Explanation: