The cephalic veins are used for which of the following? *As an insertion point for I. V. lines
To determine heart rate
Venipuncture
To determine blood pressure

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

This is the process of making a prediction based on the results of prior observations of similar events.

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.