Explain how a symbiotic relationship like the one described in the endosymbiotic theory would have benefited each cell.

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas

The basic types of tissue in the human body are

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d