Xavier is practicing the 100-meeter sprint. Which statement BEST describes the process his muscles will utilize to produce the quick energy needed for this exercise? A. His muscles will undergo aerobic respiration
B. His muscles will undergo anaerobic respiration
C. His muscles will undergo photosynthesis
D. His muscles will not undergo any process

Know its a or b but I dont know which one can anyone help

In what part of the body does the most muscle activity happen?

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.

Look at the photo of the leaf, which term best describes this leaf ? a-simple.b-parallel.c-lobed.d-tooth.