The data here indicates the number of species of amphibians that are affected by several factors in their environments. Which human action would most greatly reduce the number of amphibian species threatened for extinction?

A) reducing the use of chemical pesticides
B) preserving habitats and preventing further habitat loss
C) preventing the movement of invasive and nonnative species across the globe
D) investing in research to identify infectious disease sources and prevention

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

What are the proteins in connectivity tissues of your foot examples of?

On a backpacking trip, kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 calories. at the school track, janelle runs the 100-meter sprint in 13.5 seconds, burning 10 calories. afterward, janelle’s leg muscles are aching and she is breathing hard, while kenny maintains normal breathing all day, even though he burns 400 times more calories than janelle. which two statements offer the best explanation for this phenomenon? a. if the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt." b. aerobic cellular respiration produces more energy, but its use is limited because of lactic acid buildup in the muscles and the resulting "oxygen debt." c. after about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce atp, resulting in "oxygen debt." d. the rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.