HELP MEEE Which statement about connective tissue is true?

•Ligaments connect muscles to other muscles

•Tendons connect muscles to bones.

•Cartilage connects bones to both muscles and other bones

•Muscles cannot contract without cartilage .

How does the study of genetic disorders such as pku biologists understand normal alleles?

Si el equipo no fuera bueno no con el entrenador.

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.