Answer the following question given this paragraph: Red blood cells are shaped like flattened disks. There are trillions of red blood cells in your blood. Each red blood cell has millions of molecules of hemoglobin. Hemoglobin is a protein that contains iron. The iron in hemoglobin gives red blood cells their red color. It also explains how hemoglobin carries oxygen. The iron in hemoglobin binds with oxygen molecules so they can be carried by red blood cells. Q: What in hemoglobin gives red blood cells their red color? Choices: - calcium - lead - barium - iron A:
iron
(Question)
Answer the following question given this paragraph: Amplitude is a measure of the size of sound waves. It depends on the amount of energy that started the waves. Greater amplitude waves have more energy and greater intensity, so they sound louder. For a video demonstration of the amplitude and loudness of sounds, go to this URL: http://www. youtube. com/watch?v=irqfGYD2UKw. Q: What is a measure of the size of sound waves? Choices: - voltage - wavelength - frequency - amplitude A:
(Answer)
amplitude
Ques: Answer the following question given this paragraph: Q: Tuataras, lizards, and snakes are members of what subclass of reptiles? Choices: - dinosaurs - arthropods - staurikosaurus - lepidosaurs A:
Ans: lepidosaurs
(Q).
Answer the following question given this paragraph: How do you think scientists test whether two populations are separate species? They bring species from two populations back together again. If the two populations do not mate and produce fertile offspring, they are separate species. Q: If two populations do not mate and produce fertile offspring, what results? Choices: - same species - large species - small species - separate species A:
(A).
separate species
Ques:Answer the following question given this paragraph: Isotopes are atoms of the same element that have different masses. Q: Atoms of the same element that have different masses are called what? Choices: - variations - radioactive - mutations - isotopes A:

Ans:isotopes
Ques: Answer the following question given this paragraph: Cell division is relatively simple in prokaryotic cells. The two cells divide by binary fission. Green and orange lines indicate old and newly-generated bacterial cell walls, respectively. Eventually the parent cell will pinch apart to form two identical daughter cells. Left, growth at the center of bacterial body, such as in Bacillus subtilis and E. coli . Right, apical growth from the ends of the bacterial body, such as in Corynebacterium diphtheriae . Q: Eventually the parent cell will pinch apart to form two identical types of what cells? Choices: - brother cells - father cells - son cells - daughter cells A:
Ans:
daughter cells