Which of these is a hypothesis? salmon are kept in their natural habitat and treated with fungicides whenever infected. the yield of salmon is 2,000 kilograms in the month of april and 1,500 kilograms in the month of october. salmon are more prone to infections during the summer than in other seasons.?

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?