Q: Leaves respond to these environmental stimuli by producing less what? Choices: - oxygen - carbonate - energy - chlorophyll A:
chlorophyll

Q: Wine, air, and gunpowder are all examples of what kind of common mixtures? Choices: - combined - contiguous - heterogeneous - homogeneous A:
homogeneous

Q: Q: What is the branch of science that studies the physical world? Choices: - social science - botany - Ecology - physics A:
A: physics

Question: Q: What are the chemical messengers used to communicate between cells? Choices: - membranes - peptides - neurons - hormones A:
Answer: hormones

*Question*
Q: A major disturbance in what results in an episode of severe weather called a storm? Choices: - the oceans - the core - the ozone layer - the atmosphere A:
**Answer**
the atmosphere

(Q).
Q: Ions can be formed when atoms lose what other particles? Choices: - neutrons - protons - shells - electrons A:
(A).
electrons