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?
a).the runner's muscles have accumulated lactic acid
b). the runner’s body has failed to perform cellular respiration
c). the runner’s cells are relying completely on aerobic respiration
d).the runner’s muscles have accumulated carbon dioxide

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

This group of organisms perform the process of ammonifcation. a. herbivores b. decomposers c. carnivores c. plants