Q: Which of these objects is visible because it reflects light toward the eye?
A: shiny metallic balloon
Q: Which part of a plant produces the seeds?
A: flower
Q: Several types of mechanisms in the body regulate the rate of chemical reactions in the digestive system. Among the most important are feedback systems, which control the release rate of
A: enzymes.
Q: What is the composition of the nucleus of an atom?
A:
protons and neutrons