Mallard ducks secrete preen oil from a gland above their tail feathers. Mallards use their beaks to collect preen oil and work it into their feathers. This gives their feathers a waterproof quality and prevents water from collecting and soaking into their feathers. To which group of organic molecules do oils belong?

nucleic acid

lipid

protein

carbohydrate

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

Which of the following would be an important part of a multi-step plan to restore the stability of the red-cockaded woodpecker's ecosystem?

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote