Thanks! A fly, bird and bat all fly by means of their wings. Which pair is most closely related?
Explain your reasoning.

Which type of bacterial reproduction is depicted in the diagram?

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

What organ systems are working to you cool down after a workout?