In the autumn, many birds will collect seeds and then hide them in various caches throughout their habitat. the birds will guard their catches from other birds, and move the caches if they start to dry out. these caches provide a food source for the birds during the winter. what is an abiotic factor that contributed to the evaluation of this set of behaviors? a. limited food availability b. being preyed upon by larger birds c. competition with other birds for space d. cold winter climate

Look at the photo of the leaf. which term best describes this leaf?

What is the next step in muscle contraction after the actin changes shape? (apex)

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.