8) Astronomers viewing light from distant
galaxies observe a shift of spectral lines
toward the red end of the visible spectrum.
This shift provides evidence that
A) Earth's atmosphere is warming
B) the Sun is cooling
I
C) the universe is expanding
D) orbital velocities of stars are decreasing

Which of the following statements about pesticides and residue is false? a. most conventionally grown produce has detectable levels of pesticides when purchased from the store. b. the us government has determined that small levels of pesticides in produce is safe for humanconsumption. c. organic produce always will be pesticide-free. d. farm workers, children, and pregnant women are at greatest health risk from pesticides. select the best answer from the choices provided.

The declining axolotl population in mexico city is an example of in overcrowded cities. a. the surpassing of support capacity b. changes to natural environments and native species c. the lack of safe homes and tenured spaces d. the effects of a growing urban heat island

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes. b. it burns more cleanly than crude oil products. c. scientists have developed new ways of extracting it. d. during its extraction, groundwater can be contaminated.