Answer:
Topoisomerase is an enzyme which participates in the unwinding of DNA helix.
Explanation:
During transcription and DNA replication, the DNA needs to be unwound in order for the transcription/replication machinery to gain access to the DNA so it can be copied or replicate, respectively.
The answer is: contribute to ozone depletion.
CFC (chlorofluorocarbon), including freon, is used as the aerosol propellant. <span>An aerosol is a suspension in the gaseous form of solid or liquid particles. when these compounds reach the stratosphere, UV light affects them and they release chlorine atoms. Chlorine atoms are capable of breaking down ozone molecules. With fewer ozone molecules, the ozone layer becomes thinner and harmful UV light passes through it. </span>
Answer:
Hidden inside ovules, Embryo sac
Explanation:
Angiosperms are a group of plants that have flowers as their reproductive structures.
The ovule is a structure found on the flower that gives rise to and contains the female reproductive cells.
It is the female gametophyte of a seed plant. It is found inside the ovules. that consists of a thin walled sac within the nucellus and contains the egg nuclei and other nuclei that become endosperm upon fertilization.
There are 9 months of pregnancy. Each trimester lasts for 3 months. So C) 4th month would be your answer.
Answer: Ecological succession is the process of change in the species structure of an ecological community over time.
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Explanation:
