Which statement best describes scientific theories?

A.) it is an educated guess that requires no testing

B.) it is supported by many different experiments

C.) it is true and can never be changed

D.) it is considered false until proven true

A group of students wants to find out how much carbon dioxide is used by plants during the daytime. What control could be used in this experiment?

What is a likely explanation for a substantial change in body form between two closely related taxa?

Some species of marine annelids that are closely related to lugworms do not have gills. Based on your understanding of basic physiological principles, do you expect the gill-less species to be smaller or larger than the lugworm species that

Only one component bone of the right coxal bone articulates with this same bone component on the other side of the body. Which of the following bone components fits this description? a) pubis. b) ischium. c) ilium.

Which of the following are found both in the auditory system and the vestibular system? basilar membrane hair cells semicircular canals ossicles

How do we detect the energy of a wavelength?

How energy in gasoline is transformed in a lawn mower

Which observation was a sign that a chemical reaction was occurring in this experiment A) formation of a solid B) change in color C) formation of gas bubbles D) production of light

Cells in multi-cellular organisms A) All look the same B) All have the same function C) Are often quite different from each other D) Are the same size in every part of the organism

Why is it necessary to cool a hot supersaturated solution slowly during a recrystallization?