Answer:
Sister chromatids. (Ans. B)
Explanation:
Sister chromatids are defined as the identical chromatids formed by the DNA replication of the chromosome, both copies of chromatids are joint together by a centromere. A pair of chromatids are known as dyad.
A set of sister chromatids formed during the S phase or synthesis phase of interphase, while all the chromosomes present in a cell is replicated. During the process of mitosis, or second division of meiosis the two sister chromatids are gets separated from each other into two different daughter cells, and each cell receives one copy of the chromosomes.
Answer:
Non-use of drugs:
1. A teen is with family and friends.
2. A teen is a healthy student and athlete
3. A teen is focused and living life free and happy.
Use of drugs:
1. A teen doesn't socialize and doesn't around too many people due to social anxiety caused by the use of drugs.
2. A teen has health problems in his liver and kidney due to the abuse of drugs and is not able to play any sports due to this permanent health condition.
3. A teen is in jail due to being caught in possession of drugs and failing a drug test and being unhappy with anxiety and addiction.
The answer is A: Mass extinction.
"Abrupt disappearance of many land and marine species" = extinction of many species.
