13. Inbreeding can be harmful to a population because it (a) increases the genetic variabil-
ity of the population (b) increases the rate of
evolution in the population (c) can increase
mortality rate of offspring (d) decreases the
carrying capacity.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

"do a testcross with a homozygous recessive plant."

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle