What is produced when there is no oxygen present for the muscle cells?

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

The same agricultural practices are used in every country of the world. select the best answer from the choices provided t f

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.