Humans interact with all levels of the world's ecosystems to obtain all of these necessities except

a. shelter

b. mates

c. food

d. energy

What is weather? A. What's happening in space at a time and place B. What's happening in our atmosphere at a time and place C. The average weather over many years D. The average temperature over many years

Why do snakes shed their skin?

Why is blood classified as a connective tissue? a) Blood connects two areas of the body. b) Blood provides mechanical support of organs. c) Blood stores large quantities of lipids. d) Blood develops from mesenchyme.

Which statement best describes the process of muscle contraction?

A bacterial cell is suddenly expelled from a warm human intestine into the cold world outside. Which one of the following adjustments might the cell make to maintain the same level of membrane fluidity that the cell had in the intestine? a.

Name the cells that are produced by the testes and ovaries

What description best explains why viruses can become more pathogenic to hosts that were not affected by the virus before?

The chief force pushing water and solutes out of the blood across the filtration membrane is A) the ionic electrochemical gradient B) protein-regulated diffusion C) glomerular hydrostatic pressure D) the size of the pores in the basement membrane of

From day 23 to 28 the progesterone levels are dropping. What effect will this eventually have on the endometrium?

When both muscles of this pair are contracted simultaneously, they flex the neck forward. When both muscles of this pair are contracted simultaneously, they flex the neck forward. a. platysma b. semispinalis c. sternocleidomastoid d. trapezius