He either didn't stretch or doesn't drink enough water or not enough potassium. im not an expert just a guess
Answer:
Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa. His extensive research on the growth of small animals such as fleas, mussels, and eels helped disprove the theory of spontaneous generation of life.
Explanation:
D, because flatworm don't use cellular respiration nor do they use photosynthesis or make their own food neither do humans, which leaves the D, which is true. :)
