Q: What kind of diseases can be difficult to treat because they live inside the host's cells, making it hard to destroy them without killing host cells? Read this paragraph and choose the correct option from the provided answers: Viral diseases can be difficult to treat. They live inside the cells of their host, so it is hard to destroy them without killing host cells. Antibiotics also have no effect on viruses. Antiviral drugs are available, but only for a limited number of viruses. Choices: - superfluous diseases - nucleus diseases - cancerous diseases - viral diseases A:
viral diseases

Q: What does the placenta sustain during pregnancy? Read this paragraph and choose the correct option from the provided answers: Placental mammals are therian mammals in which a placenta develops during pregnancy. The placenta sustains the fetus while it grows inside the mother's uterus. Placental mammals give birth to relatively large and mature infants. Most mammals are placental mammals. Choices: - the heart - the mother - the endocrine system - the fetus A:
the fetus

Q: How many chromosomes are in each set? Read this paragraph and choose the correct option from the provided answers: Human cells normally have two sets of chromosomes, one set inherited from each parent. There are 23 chromosomes in each set, for a total of 46 chromosomes per cell. Each chromosome in one set is matched by a chromosome of the same type in the other set, so there are actually 23 pairs of chromosomes per cell. Each pair consists of chromosomes of the same size and shape that also contain the same genes. The chromosomes in a pair are known as homologous chromosomes . Choices: - 22 - 21 - 13 - 23 A:
23