After several miles of running and sprinting in intervals, the runner’s muscles ache and feel fatigued. which is the best explanation for what has occurred?
the runner's muscles have accumulated lactic acid.
the runner’s body has failed to perform cellular respiration.
the runner’s cells are relying completely on aerobic respiration.
the runner’s muscles have accumulated carbon dioxide.

Match the type of adaptation to the correct example, structural adaptation functional adaptation behavioral adaptation example type of adaptation elephants live in herds to protect their young leaves of a rain forest plant species have a pointed tip that enables rainwater to drain off easily. camels have nostrils that they can close snakes produce venom to kill prey and defend themselves. earthworms coil when touched, as part of a defense mechanism. human skin darkens with increased exposure to sunlight.

In a cladogram' when does a group of organisms branch off

Which blood cell spend most of their time in the lymphatic system?