A main function of the leaf petiole is a. to extend the leaf blade away from the stem so the blade can collect sufficient sunlight. b. to keep the leaf away from the secondary meristem of the stem. c. to produce pollen. d. none of the above

Water vapor will return to Earth in about 10 days t/f

Which connective tissue forms the outer surface of each skeletal muscle? endomysium epimysium perimysium aponeurosis

Cattle live in an area where the streams are dry. For which basic need do these cattle most likely compete? energy, food, shelter, water

In the swallowing reflex the soft palate, larynx, and hyoid bone are raised. the epiglottis closes off the top of the trachea. the tongue presses against the uvula and soft palate. muscles pull the pharynx upward toward the food.

A waxy secretion produced by glands in the ear canal is:

What Taxon that consists of one or more orders

The storage of carbon dioxide in the ocean is an example of an interaction between: A. None of these B. Hydrosphere and Lithosphere • O C. Lithosphere and Atmosphere O D. Atmosphere and Hydrosphere

Is paramecium a unicellular or multicellular organism

Which are examples of negative feedback? Select three options. a child whose thymus gland is building an immune system that gets stronger each day when someone's adrenal gland reacts to a scary movie by secreting hormones that make the heart beat

What do mature red blood cells lack so that they can hold as much hemoglobin as possible?