What is main difference between a lake ecosystem and a pond ecosystem?

a. a lake ecosystem has salt water a pond ecosystem does not

b. a pond ecosystem has salt water a lake ecosystem does not

c. a pond ecosystem covers a much larger area than a lake ecosystem

d. a lake ecosystem covers a much larger area than a pond ecosystem

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.