Q: Electrical messages are carried by chemicals called what? Choices: - receptors - amino acids - Biotoxins - neurotransmitters A:
neurotransmitters

(Question)
Q: Represented in equations by the letter "g", what pulls objects down to the earth's surface? Choices: - energy - motion - light - gravity A:
(Answer)
gravity

Ques: Q: What is formed when an element gains one or more electrons? Choices: - cation - ion - neutron - anion A:
Ans: anion

(Q).
Q: What is it called when organisms with traits that better enable them to adapt to their environment tend to survive and reproduce in greater numbers? Choices: - natural distribution - adaptation - evolution - natural selection A:
(A).
natural selection

Ques:Q: What cycle completes the breakdown of glucose begun in glycolysis? Choices: - bacterium - vireos - priebus - krebs A:

Ans:krebs

Question: Q: Cells with different functions often differ in what physical property? Choices: - density - size - weight - shape A:
Answer:
shape