Answer:
b. False
Explanation:
Angina pectoris is the medical term for chest pain that results from coronary heart disease.
It occurs when the heart muscle doesn't get as much blood as it needs and is usually caused by the accumulation of plaque on the inner walls of the heart’s arteries.
Answer:
Natural selection produces changes most quickly in species with short reproductive cycles.
Explanation:
Natural selection implies a process of changes in the genome of species, induced by their environmental conditions, which allow them to survive. The processes of natural selection usually manifest themselves after long periods of time and are synonymous with adaptive evolution.
Since natural selection depends on the changes observable in successive generations within a species,<u> in organisms with short reproductive cycles the changes promoted by natural selection could be observed most quickly</u>.
Learn more:
Natural selection and evolution brainly.com/question/312738
Answer:
muscle cells in the legs of a marathon runner
Explanation:
Mitochondria are the powerhouse of cells and serve as a site for the aerobic stage of cellular respiration. Cellular respiration is complete oxidation of nutrients in the presence of oxygen to produce a large number of ATP molecules. Therefore, the cells that require more ATP molecules as an energy source would most likely have a greater number of mitochondria.
Muscle cells are responsible for body movement. Muscle cells in the legs of a runner would require a constant supply of ATP during running since muscle contraction requires ATP. To sustain the continuous muscle contraction during the marathon, the muscle cells in the legs of the runner would have most number of mitochondria.
A flagellum is a whip-like structure that allows a cell to move. They are found in all three domains of the living world:bacteria, archaea, and eukaryota, also known as protists, plants, animals, andfungi. While all three types of flagella are used for locomotion, they are structurally very different.
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