9. a biologist wants to know how the absence of a certain mineral nutrient will affect the bone growth of a laboratory rat.
the biologist performs the following four experiments. experiment 1: feeds the rat 100 mg of the nutrient a day, and
measures bone growth over 30 days. experiment 2: feeds the rat 50 mg of the nutrient a day, and measures bone
growth over 30 days. experiment 3: feeds the rat 25 mg of the nutrient a day, and measures bone growth over 30 days.
experiment 4: feeds the rat 0 mg of the nutrient a day, and measures bone growth over 30 days. which is the control
experiment?
o a. experiment 1
o b. experiment 2
o c. experiment 3
o d. experiment 4

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?