A student wants to create a program that will reduce the amount of garbage at her school. In order to get the principal’s approval for her program, she needs to demonstrate that the school’s current waste is a problem. What of the following would best demonstrate that the school’s waste is a problem?a. setting up a system for students to throw their garbage away when they leave school premises b. researching how other schools reduced the amount of garbage they produce and following their model when designing the new program
c. looking in the school dumpster for waste that can break down naturally and using it to explain that not all garbage is bad for the environment
d. measuring the amount of garbage the school produces and taking pictures of the local landfill to show how garbage can contaminate the environment

Describe how alleles and genes are related

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.