Why do some investigations require a control?

What causes eclipses? Check all that apply. Earth's rotation on its axis moon's shadow covering the Sun Earth's shadow covering the moon Earth's orbit and moon's orbit occasionally aligning the moon and Sun's gravity pulling in the same direction

Does pollution stay over the city where it originates

Identify the type of macromolecule that is constructed of long chains of monomers called amino acids. A) carbohydrates B) nucleic acids C) proteins D) lipids

Lactase is an enzyme composed of a single polypeptide that hydrolyzes the disaccharide lactose to produce monosaccharides. The optimal ph for lactase activity is 6.

Alfonso is very tall and thin and cannot seem to add any muscle, although he works out in the gym four days every week. while at the gym, alfonso compares his lack of muscle with the muscles of other men who work out at the gym.

The process of creating a current in a circuit by changeing a magnetic field

Explain why the fact that invasive species did not co-evolve with the native species unbalances an ecosystem.

23 - You work for a furniture moving company. Your boss sends you to the hardware store to buy tie down rope. He tells you to buy the best deal. What is the best deal on rope? 10 feet for $7.00 20 feet for $13.00 50 feet for $28.00 100 feet for $57.

How does an atom become a positive ion?

The one-celled eukaryotic organisms above are often found in freshwater ponds. What is one characteristic they all have in common? A Nucleus B Cilia C Flagellum D Pseudopodia