What is the maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen?
A) 1
B) 2
C) 4
D) 6
B
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Many species of insects undergo a state of arrested development in their life cycle to avoid desiccation or cold, referred to as
A) torpor. B) hibernation. C) diapause. D) metamorphosis.
Some scientists suggest that organic molecules were introduced into Earth's atmosphere when ________ crashed into Earth
Fill in the blank(s) with correct word
The fossil record used to support evolution is not complete. In fact, large gaps exist in the fossil record. As a result, the evolution of a species cannot be completely traced in many cases. What is one reason why the fossil record is incomplete?
A) Fossils can form only from the remains of complex organisms. B) Many species lived in environments that did not favor fossil formation. C) The fossil record only contains the fossils of land organisms. D) Fossils can survive only for 10,000 years.
Which molecule is composed of a chain of amino acids?
A) carbohydrate B) lipid C) protein D) nucleic acid