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.

1.the evidene of the reaction

2.yes

3.yes

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."