Biotechnology is changing an organism’s genes to make new molecules, B.
Im totally guessing here but im gonna go with choice b
Several genes determine your skin color; this is a DNA-generated phenotype. However, if you spend a lot of time in the sun, your skin will be darker. This is an environmental influence on your phenotype.
A group of same kind of cell is called tissue
The least dense layer of the atmosphere is the exosphere as it is the outer most layer of the atmosphere. Hope it helps!
