1.In this environment, which trait is adaptive for the birds 2. Did the birds choose to have the adaptive trait? (yes or no)

3.Sherman suggests that reproduction always creates individuals with adaptive traits. Does this seem correct? Why or why not?

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)