Which of the following correctly describe veins?

select all that apply.

major site of gas exchange with body tissues

depend on body movement to move blood along

thin-walled

contain valves to prevent backflow

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

List two limitations of natural selection

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?