Muthr had a list of 6 basic skills for humans: 1-trust technology 2-signal others 3-find shelter 4-create fire 5-procure food and water 6-know first aid. How did those skills help or hinder Eva's survival in the "real world"? Given her experience, did Eva find the list was in correct order for survival? Explain your answer.

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

The mantle is made up of which structural zones?