24. Vampire bats: sometimes beg for blood from another bat that is a close genetic relative. are one of the few species in which individuals cannot recognize other individuals. sometimes regurgitate blood into the mouth of an unrelated bat that is close to starving. exhibit reciprocal altruism but not kin selection. exhibit kin selection but not reciprocal altruism. 25. Which of the following is NOT true of glial cells? They are responsible for breaking down and destroying old neurons. They manufacture myelin for the neurons. They store electrical signals and are the site of most memory storage in the brain. They are often the cells that cause brain tumors. They provide physical and nutritional support for the neurons. 26. When it comes to mating, the sex with the greater early energetic investment in reproduction will: be less interested. be more discriminating. be less discriminating. often offer a nuptial gift to potential mates. compete extensively with access to 27. Injecting a female prairie vole with an oxytonin blocker will have which of the following effects? a) b) The female will experience uterine contractions. Male voles will reject the female and any of her offspring. The female will be unable to produce offspring. The female will not bond with the male that she mates with. All of the above are correct