Explain why carnivores are subject to biological magnification of substances like DDT and PCBs

Structures in plant leaves open and close to maintain homeostasis are called

What are some physical and chemical characteristics of a eutrophic lake?

A tick is feeding on blood from a deer which term describes this relationship A:consumer B:decomposer C:herbivore D:producer

What is Watson & Crick known for? How do we use that knowledge today?

How would the genetic inheritance of a gene producing abnormal gap junctions affect muscle tissue?

Creationists criticize the idea of natural selection as a circular argument, or tautology, claiming "The fittest are those that survive, and survival is how fitness is defined." Why is our definition of natural selection not tautological? a.

Atoms combine to form what? A. elements b. proton c. molecules

A blastocyst is a group of cells that forms after a human egg is fertilized. The blastocyst consist of two types of cells. Some of these cells develop into all of the cells of a growing fetus. What do the other cells develop into? A.

Select the atoms that are likely to lose electrons to form cations: A. Iodine (I) B. Lithium (Li) C. Bromine (Br) D. Potassium (K)

How does a law differ from a theory? A. A law is a theory that has been proven to be true and universal. B. A theory is a group of hypotheses that prove a law is true. C. A law is a statement of fact, but a theory is an explanation. D.