Muscle fibers that have many mitochondria and contain myoglobin are (a) fast-twitch muscles. (b) skeletal muscles. (c) smooth muscles (d). slow-twitch muscles.

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity hurry!