According to the cell theory, what is a Similarities of all single celled and multicellular organism? a)
Both are composed of cells

b)
Both have tissues and organs

c)
Both have cells with rigid cell walls

d) Both are visible to the naked eye

Both are composed of cells?

Explanation:

* Tissues and organs are made up of multiple cells so they wouldn’t be present in single celled organisms

* Not all multicellular organisms have rigid cell walls (animal cells only have a cell membrane)

* Most single celled organisms are not visible to the naked eye

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

: )