Arespiratory disease caused from smoking is
a. asthma.
b. emphysema.
c. bronchitis.
d. tuberculosis.

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

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?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?