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Besides Darwin, the theory of evolution by means of natural selection was also independently proposed by __________.

Proteins are polymers formed of structural units called __________.

In the crystal matrix of ordinary salt, the sodium and chlorine are held together by __________.

Multiple independent experiments have demonstrated that phytochrome helps trigger seasonal change responses in plants such as changing color and loosening of leaves. Plants have the ability to respond to seasonal changes in their surroundings. This statement is an example of __________.

A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?

Which of the following is true for an organism in the Plantae kingdom? (You may select more than one answer)

Cilia and flagella of eukaryotic cells are composed of __________.

Matthew noticed that his house plants were wilting badly. Which cell structure had most likely contracted?

A modified form of cellulose found in the exoskeletons of insects and crustaceans is known as __________.

The proposal that one type of organism can change gradually into another type over a long period of time is known as __________.