2. Nitrogen, as it is found in the ATMOSPHERE, can be used by plants and animals.
TRUE OR FALSE?

false

Explanation:

Although the majority of the air we breathe is N2, most of the nitrogen in the atmosphere is unavailable for use by organisms. This is because the strong triple bond between the N atoms in N2 molecules makes it relatively unreactive. However organisms need reactive nitrogen to be able to incorporate it into cells.

Contraception refers to the use of means to prevent sexual intercourse resulting in pregnancy. It is defined by the World Health Organization as "the use of agents, devices, methods or procedures to reduce the likelihood of conception or avoid it".

The right answer is:

a. this is the most effective method. it is the only way to ensure that pregnancy won't happen

==> abstinence

B. this contraceptive is a plastic cup that is inserted before sexual activity

==> diaphragm

c. this method involves a vasectomy in males and a tubal ligation in females

==> sterilization

d. this contraceptive is inserted under the skin of a women's upper, inner arm. ==> implant