In 1974 an almost complete skeleton of Australopithecus afarensis was found in Africa. The fossil was called "Lucy." Lucy had apelike shoulders and forelimbs. However, the pelvis indicates that she was bipedal. The size of her brain was small, an apelike characteristic. What did the study of Lucy help paleoanthropologists determine? Select TWO correct answers.

A. Hominids had large brains before they walked upright.

B. Hominids walked upright before they had large brains.

C. Hominids are primates with opposable thumbs.

D. Human characteristics evolved at different rates and, therefore, at different times.

Coat color in cats is determined by genes at several different loci. at one locus on the x chromosome, one allele (x ) encodes black fur and another allele (xo) encodes orange fur. females can be black (x x ), orange (xoxo), or a mixture of orange and black called tortoiseshell (x xo). males are either black (x y) or orange (xoy). bill has a female tortoiseshell cat named patches. one night, patches escapes from bill\'s house, spends the night out, and mates with a stray male. patches later gives birth to the following kittens: one orange male, one black male, two tortoiseshell females, and one orange female. what are the genotypes of patches, the stray male, and the kittens?

20 the compound al(nh3)2 has atoms of nitrogen.

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm