Explain why the rate of the reaction slows down above the enzymes optimum temperature

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important