Why are frogs said to have " two lives"

What can be found in every skeletal muscle? a. nerves, bones, cartilage, and connective tissue b. tendons, cartilage, nerves, and blood vessels c. muscle fibers, nerves, connective tissue, and blood vessels d. tendons, nerves, blood vessels, and bones

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi