Which of the following examples likely occurred through natural selection?
A.
In a litter of puppies, some puppies have brown fur while others have black fur.
B.
Some humans have hair on the middle part of their fingers, while others do not.
C.
There are several colors of roses, such as red, white, pink, and yellow.
D.
Giraffes have longer necks than their ancestors.

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled

How do high-energy electrons from glycolysis and the krebs cycle contribute to the formation of atp from adp in the electron transport chain? a. high-energy electrons interact with pyruvic acid to create a phosphate bond with adp, forming atp. b. high-energy electrons supply the needed energy to synthesize atp from the lower-energy adp in the electron transport chain. c. high-energy electrons supply a negative charge which causes the citric acid to oxidize, forming a phosphate group to bond with adp. d. high-energy electrons increase the temperature of adp so it easily reacts to form atp.

Male satin bowerbirds build bowers like the one shown below. they decorate the bowers with brightly colored blue objects in order to attract females. male bower birds attract mates with their a. feathers b. looks c. behavior d. songs