What is a nebula? A. The core of a massive star B. A cloud of gas and dust in space C. A swirling disk with a lot of gravity D. The debris remaining after a supernova

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

Where does the citric acid cycle take place in eukaryotic cellular respiration?

Which statements about a food chain are true? choose all answers that are correct. a.plants are the first living organisms in food chains on land. b. the plants in a food chain are called herbivores. c. all food chains on land begin with energy from the sun. d. carnivores in a food chain eat only plants.