Mammals and birds eat more often than reptiles. Which of the following traits shared by mammals and birds best explains this habit? Mammals and birds eat more often than reptiles. Which of the following traits shared by mammals and birds best explains this habit? terrestrial living ectothermy endothermy amniotic egg insulating body cover

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

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.

Use the numbers to place the companies in order of greatest comparative advantage to least comparative advantage in producing large tubes of toothpaste.