Some tissues, such as those in skin, are soft. Others, such as bone are harder. How do differences among cells explain this variation in tissue? a. Cell walls grow in hard tissues but not soft ones.
b. Smaller cells arise in softer tissue, while larger cells arise in harder tissues.
c. Cells die in harder tissues and then get pressed into dense solids over time.
d. Cells in one tissue perform a different function from cells in a different tissue.

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?

What happens to the velocity of the car when the upward pull of the cable is greater than the downward pull of gravity as the car rises toward the top?

What is the length x of the side of the triangle below? (hint: use the cosine function)