Q: Despite its small size, an erythrocyte contains about 250 million molecules of what? Read this paragraph and choose the correct option from the provided answers: Choices: - calcium - plasma - potassium - hemoglobin A:
hemoglobin

Q: Bacterial contamination of foods can lead to digestive problems, an illness known as what? Read this paragraph and choose the correct option from the provided answers: Bacterial contamination of foods can lead to digestive problems, an illness known as food poisoning . Raw eggs and undercooked meats commonly carry the bacteria that can cause food poisoning. Food poisoning can be prevented by cooking meat thoroughly, which kills most microbes, and washing surfaces that have been in contact with raw meat. Washing your hands before and after handling food also helps prevent contamination. Choices: - acid reflux - headache - ulcers - food poisoning A:
food poisoning

Q: When vertebrate animals metabolize ammonia what is the primary byproduct that is produced? Read this paragraph and choose the correct option from the provided answers: 41.4 Nitrogenous Wastes Ammonia is the waste produced by metabolism of nitrogen-containing compounds like proteins and nucleic acids. While aquatic animals can easily excrete ammonia into their watery surroundings, terrestrial animals have evolved special mechanisms to eliminate the toxic ammonia from their systems. Urea is the major byproduct of ammonia metabolism in vertebrate animals. Uric acid is the major byproduct of ammonia metabolism in birds, terrestrial arthropods, and reptiles. Choices: - carbon monoxide - dioxide - proteins - urea A:
urea

Q: What helps represent age-sex structure of the population? Read this paragraph and choose the correct option from the provided answers: The age-sex structure of a population is the number of individuals of each sex and age in the population. Age-sex structure influences population growth. It is represented by a population pyramid. The number of survivors at each age is plotted on a survivorship curve. Choices: - habitat chart - density graph - biome model - population pyramid A:
population pyramid