A researcher is trying to design an experiment to measure the amount of energy a person uses during different activities. He proposes to measure heart rate as an indirect measure of metabolic rate. Which of the following would give him a more precise measure of energy use?
A. Comparing the amount of sugar released in the urine before and after the activity
B. Measuring the amount of carbon dioxide released from the lungs during the activity
C. Monitoring the number of calories voluntarily consumed following the activity D. Tracking the increase in sweat production over the course of the activity

For their summer holiday, jane and her family are visiting places surrounding the mediterranean sea. which type of biome is jane and her family visiting? a. rainforest b. shrubland c. tundra d. coniferous forest

The images show the wings of a bat and a bee. from this evidence, what can you conclude about the evolutionary relationship between these organisms? a. the wing structures of the bat and the bee are different, indicating they didn’t inherit wings from a common ancestor. b. the wing structures of the bat and the bee are different, indicating they inherited wings from a common ancestor. c. the functions of bat wings and bee wings are the same, indicating they obtained wings from a common ancestor. d. the functions of bat wings and bee wings are different, indicating they didn’t obtain wings from a common ancestor.

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?