Identify the pairs of rates as equivalent or not equivalent.

These fractions are equivalent:

3/14= 21/98, 9/12= 21/28, 2/14= 1/7 and 3/21= 1/7.

These fractions are not equivalent:

3/7 is not equivalent to 1/7, 2/5 is not equal to 1/4.

Explanation:

Fractions are said to be equivalent if when the numerator of one  is divided by the its denominator and  the answers are the same when same is done.

Fractions are said not to be equivalent if when the numerator is divided by the denominator of one, then, the result is different from the other fraction when same is done.

the answer to your question is sperm

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.