Select three ways a virus can enter a cell.
a. the virus dissolves the cell membrane and then exits the cell.
b. the virus remains inside but injects dna or rna out the cell.
c. the virus remains outside but injects dna or rna into the cell.
d. the virus dissolves the cell membrane and then enters the cell.
e. projections on a virus match receptor sites on a cell membrane.
f. projections on a virus do not match receptor sites on a cell membrane.

I think C, D and E are correct but wait for a third opinion.

I am most unsure about E I think it is refering to endocytosis.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602