Q: Q: Name the plant considered to be the ancestor of plants? Choices: - brown algae - ferns - grass - green algae A:
A: green algae

Q: Q: There is always a slightly negative pressure within what cavity, helping keep the airways of the lungs open? Choices: - anal - cervical - spinal - thoracic A:
A: thoracic

Q: Q: What are electrons in the outer energy level of an atom called? Choices: - shell electrons - outer electrons - positive electrons - valence electrons A:
A: valence electrons

Q: Q: When the ph of precipitation is lowered because of air pollution, what results? Choices: - abnormal rain - climate change - sleet - acid rain A:
A: acid rain