4. Which statement is not correct when discussing myofibrils? * A. each skeletal muscle fiber contains hundreds or more myofibrils.
B. myofibrils contain repeating units called sarcoñeres.
C. filaments consist of bundles of myofibrils.
D. myofibrils extend the length of a skeletal muscle fiber.

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

In the practice of science, this type of reasoning is used to develop explanations.