a biology student wants to conduct a study of how much sunlight affects the length of sleep for mice. she sets up four cages with a mouse in each cage. what are the independent variable, dependent variable, and constants?

The correct answer will be options-

1. Indpendent variable: amount of sunlight

2. Dependent variable: sleep of mice

3. Constants: amount of water, temperature, amount of food, size of cage and exercise wheel.

Explanation:

The experiment is designed to find the answers to a question. In the given question the experiment was performed to study the effect of sunlight on the sleep pattern of mice.

The experiment variables in experimental design can be categorized  into three classes:

1. Independent variable: The variable which can be controlled and can be changed easily in an experimental setup like the amount of sunlight can be changed.

2. Dependent variables: The variable which is being studied in an experiment like the sleep of mice.

3. Constants: The variable which is kept constant throughout the experiment but can affect the dependent variable like the amount of water, temperature, amount of food, size of cage and exercise wheel.

Thus, the selected options are the correct answer.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.