Select the correct answer. Over the last 250 million years, the world changed from a single land mass to a number of different continents. One reason for the change is expanding ocean floors. What causes ocean floors to expand?

Which part of the plant cell performs photosynthesis?

Which of the following microorganisms cannot multiply on their own? 1. Bacteria and protozoa 2. Algae and fungi 3. Fungi and virus 4. Viruses

Which form of starch has a "straight" structure, that is, no branching of glucose units? a. Amylopectin b. Amylose c. Dextrin d. Maltodextrin?

What dictates the structure of a protein molecule synthesized by the body? the body's need for a protein the dna inside the nucleus of the cell the number of essential amino acids available the combination of proteins consumed in the diet?

Which of the following is NOT correctly matched with the organ system. A. Anxiety - Nervous system B. Nausea - Digestive system C. Weight loss - digestive system D. Joint pain-skeletal system

Fibroblasts are cells that can be isolated from the connective tissue under the skin and grown in culture.

What does the word "skepticism" means in science

Which system and rationale best pairs with the musculoskeletal system to ensure fluid movement of the human body? 1. the digestive system, to obtain the energy that is needed to move the muscles with smooth, coordinated effort 2.

What is a weak, temporary bond

Why does the need for living space cause problems for some organisms?