Burning a candle is a chemical change. What is the primary evidence that burning the candle is a chemical reaction?

A) change in odor

B) change in color

C) formation of a solid

D) temperature change

Approximately how many species of spiders are there?

If the probability of having children with a straight hairline is 100%, what are the genotypes of the parents?

A higher concentration of molecules cause a faster chemical reaction This is known as__.

The cause of type 1 diabetes is the destruction of insulin-producing sites by

The pressure exerted against the walls of the artery when the left ventricle contracts is called the emt

Rubbing the balloons against the woolen fabric or your hair creates static electricity. This involves negatively charged particles (electrons) jumping to positively charged objects.

Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle? A) gamma aminobutyric acid B) acetylcholine C) cholinesterase D) norepinephrine

How does gas like oxygen get across the cell membrane?

Why are there so few aquatic plants and phytoplankton that live at the bottom zones in the ocean? a. the ocean floor contains many de composers b. most sunlight is absorbed before reaching these levels c. water is limiting factor d.

Which of the following is not a property of a base? Feels slippery to the touch Changes red litmus to blue Has a sour taste Produces OH - ions