Answer:
cell membrane's main function is to act as a selectively permeable barrier to the transport of materials across it. Membrane is made up of phospholipids arranged in a bilayer fashion. The phospholipids are amphipathic in nature, that is, contain both a hydrophobic and a hydrophilic end.
Explanation:
Answer:
D) A thing or event that causes a reaction.
Explanation:
The pictures are blurry, could you resend them? I can help with some in the comments
Answer: Aristotle and Ptolemy had both assumed each planet is attached to a single sphere, but geometers and astronomers could employ a number of such spheres to generate the observed motions of the planets.
Explanation:
<span>advancing mass of warm air, in particular, the leading edge of the warm sector of a low-pressure system.</span>
