Which describes step three of a muscle contraction?
a. the sarcomere lengthens.
b. the space between sarcomeres increases.
c. actin and myosin are partially overlapped.
d. actin and myosin are completely overlapped.

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous a) nuclei. b) ribosomes. c) lysosomes. d) golgi bodies.

Dan made the table shown to describe two different relationships between animals. organism interactions relationship a relationship b one organism lives inside the organism it feeds off no organism is harmed which of the following statements is most likely correct?