Why do scientist use control when designing experiments

The molecule of water is decribed as a polar molecule

When a person is experiencing heartburn, he or she feels a burning sensation in the throat and midchest. Think about the structures of the digestive system. What most likely causes the burning sensation?

Part a - blue-light photoreceptors and phototropism complete the flowchart to identify the process by which blue-light photoreceptors and auxin control phototropism in plants. drag the labels to their appropriate locations on the flowchart.

A group of freely interbreeding organisms constitute a: a. family b. genus c. species d. class

What would happen if the amount of fresh water entering mono lake increased

Protists are at the bottom of the food chain. If the water where the protists live becomes contaminated, how will it affect the food chain?

If an environment changes and an organism doesn't have an adaptation to the new environment, what's going to happen to that organism?

Which theory says that populations change slowly over time? The theory of evolution The theory of natural selection The cell theory Theory of extinctions

How does the filtration membrane prevent certain substances from entering the filtrate?

List and describe 3 senses that sharks use to locate prey.