Which of the following causes the change from day to night? a. the rotation of the sun b. the rotation of the earth c. the revolution of the earth around the sun d. the revolution of the moon around the earth

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?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

How many electrons can occupy any electron orbital?