Which of the following best defines the carbon cycle?
a. cycling of carbon that is essential for life and climate processes
b. cycling of carbon that involves changes between the solid, liquid, and gas phases
c. cycling of carbon dioxide that is essential for life and climate processes
d. cycling of carbon dioxide that involves changes between solid, liquid, and gas phases

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical?

Charles darwin published his theory of evolution in 1859. in what way foes modern evolutionary theory differ from the theory as proposed by darwin? a) darwin inferred that individuals can evolve, but modern generic science has shown that this is not true. b)darwin inferred that individuals do not evolve, but modern genetic science has shown that this is not true. c)modern science has disproved most of darwin's original theory of evolution, because darwin knew nothing about generations and their role in heredity. d)generic studies have shown that gene expression and other factors operate along with natural selection, but most of darwin's theory has been supported by modern science.

How many chromosomes are in a gold fish?