When a bumblebee lands on a flower, it pumps its abdomen up and down to move oxygen into its system of tracheae through the round openings called ________ on its abdomen
Fill in the blank(s) with correct word
spiracles
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Following reports that stained chromosomes "disappeared" while observing cell division, scientists in the early 1900s determined the molecule of heredity to be
A) DNA. B) RNA. C) protein. D) lipids. E) carbohydrates.
Organisms that produce all of their offspring in a single event are
A. always successful. B. never successful. C. continuously iteroparous. D. semelparous. E. seasonally iteroparous.
Explain the two opposing hypotheses that currently exist about the origin of modern humans. What will be an ideal response?
Why are some reactions exothermic?
A) The products have lower potential energy than the reactants. B) They are spontaneous. C) They are not spontaneous. D) The products have higher entropy than the reactants.