The two strands of a dna double helix are held together by:
a. ionic bonds.
b. hydrogen bonds.
c. nonpolar covalent bonds.
d. polar covalent bonds.
e. hydrophobic exclusions.

What are two reasons for why a species might disappear from the fossil record?

Which of the following is an example of competition that could be found in a forest? question 14 options: deer eat berries and their droppings seed new areas creating more berry bushes two fox populations utilize the same rabbit population as their main food source two hawk populations utilize the same scorpion population as their main food source lack of sunlight due to changes in the seasons restricts the growth of certain plants

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat