Q: Work is done only if a force is exerted in the direction of what? Choices: - wind - north - gravity - motion A:
motion

Q: How many electrons does lithium have? Choices: - four - seven - two - three A:
three

Q: Q: What is the layer above the troposphere? Choices: - thermosphere - mesosphere - troposphere - stratosphere A:
A: stratosphere

Question: Q: Many microorganisms are single celled and use what for perception and movement? Choices: - nucleus - mitochondria - chloroplasts - organelles A:
Answer: organelles

*Question*
Q: Which gland is an extension of the hypothalamus? Choices: - adrenal gland - pineal gland - salivary gland - posterior pituitary gland A:
**Answer**
posterior pituitary gland

(Q).
Q: What reinforces the thin walls of the right ventricle and plays a crucial role in cardiac conduction? Choices: - pores band - moderator valve - pores valve - moderator band A:
(A).
moderator band