Mechanical advantage may be calculated using all of the following except

a. counting the number of supporting ropes of a pulley system

b. dividing resistance force by effort force

c. multiplying resistance force by effort force

d. dividing effort distance by resistance distance

Providing immunity by injecting the body with a weakened form a pathogen is known as

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.