Please help me in biology asap, 20 points for answering thanksss

a) blood from the heart flows through your capillaries and collects oxygen from the alveoli. while that happens, co² passes out of the capillaries and into the alveoli. when you breathe out, you get rid of co² and oxygen is returned to the heart and pumped out to the body.

b) digested nutrients are absorbed into the bloodstream through capillaries in the villi that line the small intestine.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.