In nature organisms mate without human interference.this is called selective breeding. hope this helps!
I'm not saying this is for sure but this is what I'm answering for mine thanks to a yahoo answers. d) Migrating bird populations and the carry capacities of local animal species. You don't have to award points or anything I just wanted to try and help. This is what I put on another persons questions as well. I hope this is helpful and accurate. I'm sorry if it is not.
It arranges as 2 layers of phospholipids where the hydrophilic(water-loving) heads face toward the outside and the hydrophobic(water-hating) tails are on the inside. They arrange like this to allow for selective permeability which is why this is what a cell's plasma membrane is made up of.
Answer:
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Answer;
D. receptor proteins
Explanation;
-Hormones bind with receptors to initiate the cellular response to a chemical signal. Target cells convert the signal into a biochemical change inside the cell. This is done via second messenger systems and also via direct gene activation.
-Receptors are complex proteins that only respond to specific hormones. Receptors for water-soluble hormones are found on the plasma membrane while receptors for lipid-soluble hormones are found in the cytoplasm or the nucleus. Receptors will down-regulate and decrease sensitivity when there is prolonged exposure to high levels of a hormone and also they have the ability to up-regulate and increase sensitivity in response to sustained low levels of a hormone.
