Answer:
Membrane proteins perform a variety of functions vital to the survival of organisms: Membrane receptor proteins relay signals between the cell's internal and external environments. Transport proteins move molecules and ions across the membrane.
Explanation:
they help transport some substances through the membrane.
Answer: It becomes more dense when it freezes.
Explanation: water becomes less dense when it freezes because ice has a cage like structure.
Answer:Eccrine sweatglnds.
Explanation:
These are major sweat gland concerned with sweat production in human,and other mammals.They are less distributed in the trunks and body extremities.But very distributed at the soles and palm.
The sweat they secreted help to cool the body temperature by making use of high latent heat of vaporization of water, to cool the core body temperature as the sweat evaporates through the sweat pores.
Interbreeding species concept-species concepts is not very useful in defining plant species because some plant groups readily hybridize with other plant groups. The biological species concept holds that organisms are members of a common species if they can interbreed and result in live, fertile offspring. Prezygotic and postzygotic obstacles separate species from one another and prevent mating or the development of viable, fertile offspring. New species emerge through a process called speciation. It happens when populations of a species diverge and become reproductively isolated. When groups from an ancestral population undergo allopatric speciation, it is because of a period of geographic isolation that they diverge into distinct species. When groups from the same ancestral population evolve into distinct species, there is no geographical separation.
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