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Bilateral symmetry allowed for the evolution of

Because ________ occurs without oxygen, scientists know that this stage in cellular respiration evolved first.

A botanist discovers a plant that lacks the ability to form starch grains in root cells, yet the roots still grow downward. This evidence refutes the long-standing hypothesis that

Mitochondria are descendants of ________ and chloroplasts are descendants of ________.

If you were asked to group lobsters with other organisms, you would place them with other

One difference between the blastula and gastrula stages of development is that _____.

From the list, select all that apply to nucleotides found in DNA.

Plants are affected by an array of pathogens. Which of the following is a likely plant defense/response against disease?

According to modern ideas about phototropism in plants,

Only 1% of the human genome is devoted to protein-encoded genes, while approximately 45% is composed of