What is a protein that is the main component of the thick filaments in muscle fibers and is responsible for muscle contraction?
a. actin
b. myosin
c. actin and myosin
d. nerve and bone

When a human or animal consumes food, the carbon in that food is most likely to be converted into which of the following elements? a. carbon remains carbon b. nitrogen c. oxygen d. hydrogen

In which of the following relationships is one organism always benefited while the other organism is always harmed

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.