(Question)
Q: Electrons are located at fixed distances from the nucleus, what are they called? Choices: - Energy layers - Positive levels - energy concentrations - energy levels A:
(Answer)
energy levels

(Question)
Q: What type of creature is a scallop? Choices: - insect - vertabrate - algae - mollusk A:
(Answer)
mollusk

(Question)
Q: What enzyme is found in the small intestine catalyzes the hydrolysis of lactose? Choices: - elastases - lipase - amylase - lactase A:
(Answer)
lactase