Which class of macromolecules store and communicate genetic information?
What will be an ideal response?
nucleic acids
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____ are chemical signals that, rather than being secreted into the bloodstream, are introduced by animals into their habitats. They can be used to attract mates and mark territories
Fill in the blank with the appropriate word.
One of the ways in which the smooth muscle contractions of the digestive tract are controlled is by
A. mass movements. B. the nervous system. C. propulsion. D. peristalsis. E. chyme secretion.
In arthropods, locomotion is accomplished by muscles that work against
A. each other. B. mineralized bones. C. a hydrostatic skeleton. D. the exoskeleton. E. the pseudocoel.
Of the following is an example of biogeography?
a. studies of the travelling around the world and observing life b. studies of the world distribution of humans c. studies of the world distribution of fungi and animals d. studies of the world distribution of plants and animals