The process in which an animal’s cells use oxygen and digested food molecules to release the energy in food is called
a. breathing
b. cellular respiration
c. diffusion
d. gas exchange

Sydney drew a flow chart to illustrate the nitrogen cycle.which labels best complete the flow chart? x: producers undergo photosynthesis.y: nitrogen compounds are released into the air.x: nitrogen compounds are released into the air.y: producers undergo photosynthesis.x: free nitrogen is in the atmosphere.y: producers absorb nitrogen compounds through their roots.x: producers absorb nitrogen compounds through their roots.y: free nitrogen is in the atmosphere.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

What is the average speed of a car that traveled 300.0 miles in 5.5 hours