Something essential that a plant or animal obtains from the environment for growth

Milk is a good source of calcium but a poor source of iron. meat is a good source of iron but a poor source of

Which of the following is not a major function of the skeletal system? A. Contains cells that produce blood cells B. Stores mineral reserves C. Protects internal organs D. Nurtures and protects developing embryo

Base-pair substitutions involving the replacement of a purine with a pyrimidine and vice versa are called: a. isomers b. transitions c. transversions d. inversions e. translations

Which of the following would be considered a source of error in an experiment A) only three house flies were collected for an experiment B) A beaker is knocked over and the contents are spilled on the floor C) the data do not support the hypothesis

Which of the following drains urine from the kidneys to the bladder?

Match these terms and definitions.! 1. forms the pole of the spindle apparatus 2. the membrane that surrounds the nucleus of the cell 3. having chromosomes that occur singly, not in matched sets or pairs 4.

Triglycerides belong to which general class of organic molecules?

A rain forest has a high level of biodiversity because it has

Which best explains how the body maintains homeostais? A. All systems work together to match the external environment B. All systems work together to stabilize the body C. Each system works interdependently to stabilize the body D.

It is an effect that drug use can have on society? A. Drug use increases pollution. B. Drug use leads to an increase in criminal activity. C. Drug use increases the spread of disease. D. All of the above