How will a ray of light traveling parallel to the principal axis of a concave
mirror be reflected back?
A. Through the vertex of the mirror
B. Through the center of curvature
C. Parallel to the principal axis
D. Through the mirror's focal point

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.