Gravitropism is the answer
<span>overall, around twenty million teenagers contract an STI (sexually transmitted infection) each year. </span>(The half of them are from U.S.)<span>
A sexually transmitted infection (STI) is an infection that is transmitted between partners during different forms of sexual intercourse. This infection can lead to an infectious disease, formerly called venereal disease (the name comes from Venus, goddess of love)All sexual practices that involve mutual genital or oro-genital contact with another person, or genital fluids, are considered to carry a risk of transmitting an STI. Each STI has a different risk and severity.
</span>
The correct answer is that it is warmed and moistened already in nose and mouth, at the very beginning, when it enters our body (answer a).
It needs to be filtered and warmed alredy before it enters further, because our internal organs are delicate and a dry, dirty air would cause damage to our lungs and other organs.
Answer:
c. Individuals experience differential success in their ability to survive or reproduce due to differences in certain traits.
Explanation:
Natural selection works on a population when genetic variations are present in its members. Some genetic traits make the organisms better adapted to the prevailing surroundings. These individuals survive more and reproduce more successfully due to the presence of specific genetic traits. Over the generations, the proportion of the beneficial genetic trait increases due to the increased reproductive success of these individuals. This is called natural selection. On the other hand, the individuals that lack these traits survive and reproduce less.