The primary function of the respiratory system<span> is the exchange of oxygen, which is needed by the body's cells, for carbon dioxide, which is produced as a waste product of cellular metabolism.</span>
It all be ends on what kind of plants you have.
Answer:
scavengers, predators, decomposers
Answer:
d.The wing-assisted incline running theory postulates that wings were initially used to maintain balance while climbing up slopes.
Explanation:
Two theories were given to explain the origin of avian flight. The top-down theory suggested that the birds' ancestors were tree dwelling species. They took help of wings to glide from tree to tree in order to avoid predator or catch prey. The bottom up theory suggested that the birds' ancestors were ground dwelling species. They took help of wings to maintain a balance and provide a lift for efficient running.
Wing-assisted incline running was a mixture of both the above theories and gave a balanced view point. According to it, birds' ancestors used wings to maintain a balance while running up inclined slopes. The wings helped them to save energy while scaling slopes and eventually a flight mechanism was also developed.
Answer:
C
Explanation:
DNA and RNA are the only nucleic acids on this list
