What happens to the uterine lining between day 27 and day 1? what is this process called ?

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?