Which of the following best describes varicose veins? a. veins cannot prevent the backflow of blood. b. veins lose the ability to transport blood to the heart. c. veins become used for transporting blood to and from the heart. d. veins become less efficient at transferring waste to the blood.

There are blank calories in a gram of carbohydrate

Little elijah is full of energy and never sits still. he loves playing with his friends and going on adventures. luckily, he rarely gets frightened and never cries when he is exploring with friends. describe the three aspects of temperament. decide whether elijah is high or low on each aspect of temperament. what are some long-term implications of temperament?

Which organisms are consumers in an ecosystem? choose all answers that are correct. 1 grass 2 bacteria 3 lion 4 wolf