Question

an experiment was designed to investigate the effect of caffeine on the heart rate of camels. 60 camels were gathered. all camels lived in the same environment and received the same amount of water, the same amount of food, and the same type of food every day. all camels were the same age, biological sex, and size. however, half were given caffeine and the other half was not. the heart rate of the camels was measured... 18. list four constants in this experiment. type a response

Explanation:

In an experiment, a constant is a factor that is kept the same across all experimental groups to ensure that the independent variable (here, the presence/absence of caffeine) is the only factor affecting the dependent variable (heart rate of canaries). From the given description, factors like the living environment, water amount, food amount, and food type are maintained uniformly for all canaries, so they are constants. Also, age, biological sex, and size of canaries are also constants as they are the same for all.

Answer:

Four constants in this experiment are: 1. The environment where the canaries live (kept the same for all). 2. The amount of water each canary receives (same for all). 3. The amount of food each canary receives (same for all). 4. The type of food each canary receives (same for all). (Other valid constants could also be the age of the canaries, their biological sex, or their size as these are also kept constant.)