Why do experiments usually test one variable at a time?

Crop rotation involves? A: Killing Pests B:Planting different crops each year C:Making more work for farmers D:Planting cheaper seeds

Define tissue and explain where it falls in the hierarchy of structural organization

At the age of 21, donte stands at 5 feet 2 inches in height. if it is believed that an endocrine gland is most likely responsible for donte's lack of growth, which gland might his doctor be most interested in studying?

Which statement best describes a climax community? A) Climax communities contain few species, including those with large body sizes. B) Climax communities contain few species and include only those with small body sizes.

Which organelle do you inherit from your mother?

When they match is burn chemical and potential l energy is converted to thermal and

What is the molten iron and nickel in the core of the earth thought to contribute to

If the seawater carbonate ion concentration is 270_mol/kg, what is the approximate rate of calcification, and approximately how many days would i take 1 square meter of reef to accumulate 30mmol of calcium carbonate (CaCO3) ?

What is the importance of decomposers in an ecosysyem such as mold?

Which statement about ddt best shows how science has been impacted by society? ddt led to insect resistance. ddt was considered harmful and was replaced by other pesticides. ddt was the first modern insecticide.