On some islands, during the mating season, birds compete ...

[savannahhooper]

On some islands, during the mating season, birds compete intensely for breeding sites. On these islands, these breeding sites represent a(n)
 
  A) limiting factor.
  B) zone of stress.
  C) environmental condition.
  D) limit of tolerance.

Question 2

Driving along a highway, you start noticing plants with tiny blue flowers. Several miles later, these flowers are very abundant. Then even further, the flowers become less abundant, until finally, you do not see them at all.
 
  The regions with just a few of these plants represented the plant's A) optimal range.
  B) zones of stress.
  C) resource reservoirs.
  D) optimal habitats.

[quynhmickitran]

Answer to Question 1

A

Answer to Question 2

B

[savannahhooper]

TYSM

[parshano]

Excellent