During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest energy level?
A. NADH
B. ATP
C. ADP + Pi
D. FADH2
E. None of the above
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The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

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

The first amino acid of a new polypeptide chain is