Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: What allows giraffes to reach leaves that other ground animals cannot? Answer: long necks
[EX A]: African Giraffes. Giraffes feed on leaves high in trees. Their long necks allow them to reach leaves that other ground animals cannot.

[EX Q]: Question: What type of tissue is made up of cells that have the unique ability to contract? Answer: muscle tissue
[EX A]: Muscle tissue is made up of cells that have the unique ability to contract, or become shorter. Muscles attached to bones enable the body to move.

[EX Q]: Question: Time, mass, length, and temperature are considered to be what kinds of units? Answer: base
[EX A]:
Base units have independent scales and cannot be described by a combination of any other base units. Examples of base units used in chemistry are length, mass, temperature, and time.