Q: What kind of organisms are yeasts? Choices: - bacteria - viruses - protozoa - single-celled A:
single-celled

Q: In what ocean is the mid-atlantic ridge located? Choices: - indian ocean - pacific ocean - arctic ocean - atlantic ocean A:
atlantic ocean

Q: Q: Cilia and flagella are extensions of what? Choices: - cell nucleus - protoplasm - cell wall - plasma membrane A:
A: plasma membrane

Question: Q: In the past, what colliding with planet earth has caused many organisms to die off? Choices: - acid rain - meteorites - the Sun - asteroids A:
Answer: asteroids

*Question*
Q: What kind of change occurs whenever matter changes into an entirely different substance with different chemical properties? Choices: - reversible change - physical change - carbon change - chemical change A:
**Answer**
chemical change

*Question*
Q: What do willow trees produce to kill bacteria? Choices: - chlorophyll - enzymes - cytoplasmic acid - salicylic acid A:
**Answer**
salicylic acid