Which statements describe the death of stars? Check all that apply.
1) star's final stages of life depend on its mass.
2) Stars die when they run out of fuel.
3) When a star starts to die, its core expands.
4) The outer portion of the star contracts.
5) All stars become black holes when they die.

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.