The answer is D i just took the test i hope you find this will help you
Regular human body cells contain a total of 46 chromosomes. Therefore, because of meiosis, sperm cells contain ____ chromosomes.
23
They can be observed in a microscope because both of them are very small to see. Mostly, they contain genetic material. Viruses need a host to keep it spreading or etc.
<span>Preserving the plants, animals and natural communities through management of the lands and waters that we need to survive. Recycling one aluminum can save enough electricity to run a television for 3 hours. In addition, we are not mining the Earth, destroying watershed or adding silt and toxic wastes to rivers by doing so. Recycling newspaper saves trees and the environment in a number of ways, including providing fish and bird habitats, cleaning CO2 and other greenhouse gases from the atmosphere, and keeping watersheds intact.</span>