Choose the letter of the correct answer. Do this in your answer sheet.
1. The wheelbarrow is a
class lever because the
is
in the middle of two other
important points.
a. 1st, fulcrum C. 3rd; effort
b. b. 2nd; load d. 2nd; effort

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

The three types is stress that act on earths rocks are compression, tension, and