What is the back portion of the brainstem

Texas bluebonnet plants seen in this photo are an example of which ecological unit?

What is the difference between bacterial infections and viral infections?

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.