White-breasted nuthatches and Downy woodpeckers both eat insects that hide in the furrows of bark in hardwood trees. The Downy woodpecker searches for insects by hunting from the bottom of the tree trunk to the top, whereas the white-breasted nuthatch searches from the top of the trunk down. These hunting behaviors best illustrate which of the following ecological concepts?
A) competitive exclusion
B) resource partitioning
C) character displacement
D) keystone species
E) bottom-up and top-down hypotheses
Grey matter and white matter in the CNS.
Emperor penguins with their black and white plumage stand out against the snow and colonies
White Lion cub at Kromdraai, South Africa
A blood smear. The smear reveals representative cells from each formed element group: red blood cell
On May 15, 1916, after deliberating for one hour, an all-white jury in Waco, Texas, found seventeen-