True, our ecosystem is not independent. Everything depends on everything else to survive. :)
Answer:
The hydrophilic part of the cell membrane is A, the phosphate head.
Charged molecules, such as K+ or Ca++ are unable to pass through the lipid bilayer because of their charge and must use a membrane protein to cross the cell membrane.
C, the lipid tails, are hydrophobic and repel water.
Answer:
A. Too much LDL can cause atherosclerosis and heart disease.
Because each carbon is identical, they all have four valence electrons, so they can easily bond with other carbon atoms to form long chains or rings
