Which of the following is the largest known gravitationally bound structure in the universe? Which of the following is the largest known gravitationally bound structure in the universe?

Galaxy

Cluster

Solar system

Local Group

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?

Pulmonary arteries carry highly oxygenated blood. true or false?