In humans, the allele for attached ear lobes (e) is recessive to the allele for free ear lobes (e). if both of lisa's parents have attached ear lobes, then a. lisa must have free ear lobes. b. lisa must have her ears pierced. c. lisa may have either attached ear lobes or free ear lobes. d. lisa must have attached ear lobes.

Attached ear lobes are recessive to free ear lobes, so an individual must be homozygous recessive (ee) in order to have attached ear lobes. Therefore, we can conclude that since both of Lisa's parents have attached ear lobes, they are both homozygous recessive (ee). In a cross between two homozygous recessive parents, all offspring will be homozygous recessive, as shown in the Punnett Square below:

 ee

eeeee

eeeee

Since Lisa must be homozygous recessive, she must have attached ear lobes.

the wires in the toaster turning red and the toast crisping and turning brown

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.