"Are Mud Snails able to reproduce both asexually and sexually?"
Embedded into the Lipid bilayer
I believe he is looking for an allele
An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosomes. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
D. In no pattern
Space has no gravity, that causes the objects to float away
A state of rest or balance due to the equal action of opposing forces.