<u>Answer</u> : option A gateway drug
<u>Explanation</u>:
- A gateway drug is considered to be a type of habit forming drug which itself may not be addictive in nature but their use may lead to the person getting addicted to other drugs.
- The increase in probability of using other illegal drugs when a person is using a gateway drug is because of the alteration in the brain which leads to an inclination towards drug usage and a carefree behavior.
- Besides alcohol, marijuana and tobacco are also considered to be gateway drugs.
- It has been shown that the use of alcohol acts a gateway for many drugs such as cocaine.
- The gateway drug theory has stated if any of the gateway drugs or a mixture of them is introduced into a life of a teenager then it leads to an increased chances of experimentation with other drugs in the future.
- Since, alcohol is linked to an increased probability of using illegal drugs in the future, it is considered to be a gateway drug.
The most likely explanation of as to why there is a high
proportion of winged individuals in a population of bean aphid was because
there is a presence of high population density or another reason is that there
is already a high population if before the aphids develop or has developed.
Answer:
I'm not sure about 9 and 10
11) True
12) False
Answer:
C.) Disruptive selection
Explanation:
Disruptive selection is also called as diversifying selection. Here, two or more extreme phenotypes are preferred over the intermediate phenotype. Since more than one phenotype is preferred here, the genetic diversity of the population increases over generations.
For example, in lobsters alpha males are able to successfully mate by using force. Smaller males can also sneak in alpha males's territory and successfully mate. Hence, both alpha males and small males will be preferred over medium sized males in lobsters increasing the overall genetic diversity of population.
