why do myelinated axons of frog having diameter of 3.5um conduct impulse at 30m/s whereas axons of same diameter in cat conduct impulses at 90m/s​

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.