Question

1. what is the experimental group?

a. the tank with regular food
b. the tank with new food
c. the amount of water
d. the mass measured

use this prompt for questions 6–10: a scientist tests how low a ph snails can survive in. she uses four identical tanks, each with 12 snails: tank 1: ph 7, tank 2: ph 5, tank 3: ph 4, tank 4: ph 3, all other conditions are the same. after 45 days she counts how many are alive.

1. what is the independent variable?

a. the 45 - day time period
b. the ph level
c. the number of snails alive
d. the type of snail

1. what is the dependent variable?

a. the number of snails alive
b. the type of snail
c. the ph level
d. the temperature

1. which of the following is a constant?

a. the ph level
b. the number of snails
c. the 45 days
d. all of the above

1. what is the control group?

a. tank 1
b. tank 2
c. tank 3
d. tank 4

1. there is more than one experimental group in this experiment.

a. true
b. false

biomolecules

1. the main purpose of lipids is to...

a. store energy long - term
b. make short - term energy
c. store genetic information
d. build enzymes

1. animals store short - term energy using a molecule similar to starch. this type of molecule is

a. lipid
b. carbohydrate
c. protein

Explanation:

Question 5

The experimental group is the one exposed to the new or manipulated condition. Here, the tank with new food (option b) is the group where the food (the variable) is changed, while the tank with regular food is the control. Options c (water amount) and d (mass measured) are not groups but variables or measurements.

The independent variable is what the scientist changes. In this snail - pH experiment, the scientist changes the pH level (tanks have different pH: 7, 5, 4, 3). The 45 - day period (a) is a constant, the number of snails alive (c) is the dependent variable, and the type of snail (d) is constant (all tanks have the same type). So the independent variable is the pH level.

The dependent variable is what is measured (depends on the independent variable). Here, the number of snails alive (a) is measured to see how it's affected by pH. The type of snail (b) is constant, pH level (c) is independent, and temperature (d) is a constant (all other conditions same).

Answer:

b. The tank with new food

Question 6