Answer the following question given this paragraph: The electrons in an atom tend to be arranged in such a way that the energy of the atom is as low as possible. The ground state of an atom is the lowest energy state of the atom. When those atoms are given energy, the electrons absorb the energy and move to a higher energy level. These energy levels of the electrons in atoms are quantized, meaning again that the electron must move from one energy level to another in discrete steps rather than continuously. An excited state of an atom is a state where its potential energy is higher than the ground state. An atom in the excited state is not stable. When it returns back to the ground state, it releases the energy that it had previously gained in the form of electromagnetic radiation. Q: What is the lowest energy state of the atom called? Choices: - work state - active state - base state - ground state A:
ground state
(Question)
Answer the following question given this paragraph: Q: The air bubbles resulting from cavitation expand and block water channels of the what? Choices: - heart - respiration - ectoderm - xylem A:
(Answer)
xylem
Ques: Answer the following question given this paragraph: Destructive interference in waves occurs when two troughs overlap. Q: Destructive interference in waves occurs when what things overlap? Choices: - two waves - three waves - three troughs - two troughs A:
Ans: two troughs
(Q).
Answer the following question given this paragraph: The atmosphere is a mixture of gases that surrounds the planet. We also call it air. The gases in the atmosphere include nitrogen, oxygen, and carbon dioxide. Along with water vapor, the atmosphere allows life to survive. Without it, Earth would be a harsh, barren world. Q: The mixture of gases that surrounds the planet and makes up the atmosphere is known as ________. Choices: - energy - vaccum - fuel - air A:
(A).
air
Ques:Answer the following question given this paragraph: All waves can be defined in terms of their frequency and intensity. Q: Frequency and intensity are two measurable properties of what? Choices: - heat - lines - troughs - wave A:

Ans:wave
Answer the following question given this paragraph: Mountain streams may erode waterfalls. A waterfall forms where a stream flows from an area of harder to softer rock ( Figure below ). The water erodes the softer rock faster than the harder rock. This causes the stream bed to drop down, like a step. This creates a waterfall. As erosion continues, the waterfall gradually moves upstream. Q: What process is involved in the formation of a waterfall, when a stream flows from an area of harder to softer rock? Choices: - calcification - migration - evaporation - erosion A:
erosion