Active transport
requires energy. This is because it is going against the natural process of diffusion. Substances diffuse when their net movement is down the concentration gradient (from higher concentration to lower). Active transport is movement from lower concentration to higher. Cytosis (phagocytosis , pinocytosis) also requires energy.
Hello. Giraffes with longer necks survive compared to those with shorter necks because of natural selection. Over time, natural selection favors the traits that would make a species thrive better in the environment. Giraffes with short necks won't have access to that much food compared to those with long necks thus they eventually died out.
ANSWER: natural selection.
ANSWER:
Radioactive element life years = 1000/2 = 500yrs.
So, Rock years
- 6.25/100 × 500
- 31.25years.
Foods that contain more than one type of molecule help us meet our daily requirement of nutrients. There is a limit to how much we can eat in a day, so if nutrient rich foods are consumed, we can easily provide the necessary building blocks for our bodies to maintain healthy function. This is not possible with foods that contain only one type of molecule.
Nerves are cells that can detect any type of pressure, movement, or anything of that nature. If we didn't have nerves, we couldn't feel pain. If the nerves in a foot are damaged, you wouldn't feel the pain of it being burned.
