Which of the following is a true statement regarding physical activity and cardiovascular health? (select all that apply.) aerobic exercise increases resting heart rate because the heart pumps more blood while in a rested state. aerobic exercise decreases resting heart rate because the heart has an increased stroke volume. aerobic exercise reduces heart disease because it makes the heart work harder, improving its strength. aerobic exercise increases ldl, or “bad,” cholesterol in the blood because blood ci

Which of the following best reflects what we know about how the flu virus moves between species? a) the flu virus in a pig is mutated and replicated in alternate arrangements so that humans who eat the pig products can be infected.b) a flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus differently and then pass it back to humans.c) an influenza virus gains new sequences of dna from another virus, such as a herpesvirus; this enables it to be transmitted to a human host.d) an animal such as a pig is infected with more than one virus, genetic recombination occurs, the new virus mutates, the virus is passed to a new species such as a bird, and the virus mutates again and can now be transmitted to humans.