Approximately 40% of living ferns are tropical epiphytes, a fact that supports the hypothesis that:
1. the origin and eventual domination of angiosperms in tropical forests both displaced and created new opportunities for other plant lineages.
2. plant lineages are conservative in their basic ecology and tend to diversify in the same environments in which they originated.
3. epiphytic ferns are all that remain of an ancient diversification of ferns that preceded the evolution of angiosperms.
4. most fern diversity is in temperate forests.

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?

Cedric has a low fever and minor aches. yesterday, he went to the doctor for his booster shot and receive the flu shot. which best explains why he has this reaction?

Monomers are the building blocks of larger molecules, called polymers. for example, proteins are composed of chains of amino acids that are linked together. cellulose is a polymer that makes up plant cell walls. cellulose is made from a chain of c6h10o5 molecules. which monomers are most likely used to produce cellulose? why?