All of the following prevent pathogens from entering the human body except

a. red blood cells

b. tears

c. mucus

d. skin

In 1999 confusion between the use of the English and metric systems resulted in the loss of the Mars Climate Orbiter, which was intended to study that planet's water history. How could costly mistakes like this be avoided in the future?

Why do you think carbohydrates are used as a source if quick energy rather than fat?

A woman steps in front of a child to keep him from running off. Which term best describes this example? A. Negative work B. Positive work C. Negative force D. Positive force

What processes are involved in gametogenesis? 1) Fertilization and zygote development 2) Mitosis and production of diploid gametes 3) Meiosis and differentiation of gametes 4) Crossing over and embryonic development

Cell contain hereditary information which is passed from parent cell to daughter cell during cell

How are centipedes adapted for a predatory way of life?

A small, dense planet made of rocky and metallic materials are called

What are some sources of oxygen

A longshore current flowing southwards along a coast will primarily transport sediments

How much does an elephant weigh?