The correct answer should be C-Earthquakes!
The question is asking on what the cell must have to bind the signaling molecule and base on my research, I would say that it is Receptor. Receptor is a protein molecule that can receive signals from the outside environment of the cell. I hope you are satisfied with my answer and feel free to ask for more
Regulating body temperature
Answer: The correct answer is C) Although the F1 generation will all show the dominant trait, the offspring will all be heterozygous and increase chances of future variation.
According to Mendelian inheritance, true breeding parents ( which are homozygous dominant and homozygous recessive) for dominant and recessive allele will always result into offsprings with heterozygous dominant genotype.
As per the question, genotype of P ( parental ) generation is AA and aa. When they are crossed together, they result into Aa offsprings, which all exhibit dominant character/ phenotype. These offsprings will increase the chances of future variation.