Imagine a very simple food chain in which orcas (killer whales) eat only sea otters, sea otters eat only sea urchins, and urchins eat only kelp (marine
algae). Orcas, sea otters, and urchins are the only significant consumers in
the system. To keep one ton of orca biomass fed, you would need about
ton(s) of kelp.*
1
10
100
1,000
1,000,000

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

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 scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits