21. B. recessive
22. D. DD and dd
23. D. FF and ff
D is gonna be your answer because the more animals the more competition for survival
Tachycardia is a condition when the heart rate is greater than 100 beats per min at rest. The electrocardiogram is a diagnostic tool that measures and records the electrical activity of the heart. Bradycardia on the other hand is when the heart rate is slower than normal. The Tachycardia and bradycardia can arise from either the SA node or from other areas of the cardiac.
Cause in such dry times the cities already use lots of water, so they banned sprinklers to preserve some of the water for the city and other uses