Read this activity and answer the following questions please..
please answer all the questions

please help..as day after tomorrow is my biology's final exam and I want to score 80/80 and I want to be 1st again in my class...

in the first question

the air move from higher concentration to lower concentration and lower to higher

Explanation:

when the oxygen gets in the place in the chest increase and when we release the air the will be contracted

when the air is outside chest will have no air

outside air  will get into  chest

and in verse vice

this is a diagram or activity to show the workingbof a lung

Explanation:

the rubber sheet is equivalent to the bottles end kept on. The bottle represents the chest cavity and the rib cage. The plastic /balloon handle represents the diaphragm.the rubber sheet wheen pulled down allows air from the straws to come into and the balloons inflate . they reinflate because they get the pull force or space to inflate more.the rubber sheet when pushed back in occupies the place which it made when was pulled and it even stops the pull forcemi am not that accurate u nay frame with your answers with these points.#i have social tmrw.all the best

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic