The answer is A. def- of a plant or animal) native or restricted to a certain country or area.
"a marsupial endemic to northeastern Australia"
Well, I don't fully understand your question. I think I know what you're getting at though.
In a system of sexual reproduction, you have genes coming from both an egg and the sperm. Therefore, it'll only contain half the total amount of chromosomes (46 in humans). A sperm will have 23, and the egg will have the other 23. Is that what you meant why the chromosomes are cut out in pairs? If that wasn't your question, please elaborate and I'll return to answer it to the best of my capabilities.
The organism will move in low-quality habitat when the benefit provided by the this habitat is same as that provided by the high-quality habitat.
Ideal free distribution is a theoretical concept in which the organism distributes itself in the environment such that the competition is minimized between the species and the fitness is increased. The ideal free distribution is assumed to have the constant distribution of organisms in the habitat. According to this theory, the organism can roam freely in all habitats provided that the resources are abundant.
Learn more about ecology here:
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Answer is membrane protein
Plasma membrane or cell membrane is made of lipoprotein (lipid and protein). The structure of the plasma membrane is based on the fluid mosaic model which gives basic description of the structure and behavior of membranes. The plasma membrane is a mosaic of phospholipids, cholesterol and proteins. Many proteins can move within the plasma membrane through membrane diffusion. The membrane proteins regulates the coming and going of substances into and out of the cell.
Fats are not an ideal sorce of energy because fats are made of phopholipids and lipids are slow moving amino acids.
