Which is one of the most important differences between prokaryotes and eukaryotes?
a. the cytoplasm in eukaryotes does not contain any organelles but that prokaryotes does
b. eukaryotes are much smaller than prokaryotes
c. prokaryotes do not have a well defined nucleus, but eukaryotes do

Match the types of competition to their descriptions.

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids

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.