Ques:Q: Corals build hard exoskeletons that grow to become coral what? Choices: - beds - layers - crystals - reefs A:

Ans:reefs
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Ques:Q: What instrument is used to record the length and strength of an earthquake? Choices: - transmitter - epicenter - microscope - seismograph A:

Ans:seismograph
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Ques:Q: What part of an atom is positive due to the presence of positively charged protons? Choices: - Neutron - Proton - Electron - nucleus A:

Ans:nucleus
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Ques:Q: After passing through capillaries and being filtered, clean blood leaves what organ through a vein? Choices: - pancreas - liver - heart - kidney A:

Ans:
kidney
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