Recruiting more and larger motor units for contraction will the strength of muscle contraction.

answer; i believe the correct answer is (replication is not conservative);

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: