You are presented with the question "What does cocaine make blood vessels do?" and the following answer choices: - It expands - contract - reduce - It decreases - harm them - kill them - Rise - Damages them Now knowing that constriction occurs when the muscular walls of blood vessels contract and cocaine constricts the blood vessels, choose the best answer.
contract

You are presented with the question "blowing air into a whistle causes a what?" and the following answer choices: - rapid blast of heat - kinetic energy - little beads - activation energy - sound source - wind speed - small rattling - mechanical Now knowing that blowing air into a whistle causes air to vibrate inside the whistle and pipe organ Vibrating columns of air inside the pipes are the sound source, choose the best answer.
sound source

You are presented with the question "What is when solids are heated and ions move freely?" and the following answer choices: - dissolving - refreshing - kinetic energy - removing - boiling - barrel-shaped - renewing - unidirectional Now knowing that melting is when solids are heated above their melting point and when melted or dissolved in water, the crystal lattice is destroyed and the ions move freely, choose the best answer.
dissolving

You are presented with the question "What do amphibians easily absorb?" and the following answer choices: - heat energy - water - Energy - Bodily water - chemicals - body water - smog - oxygen Now knowing that amphibians have permeable skin that easily absorbs substances from the environment and chemicals can be very toxic to permeable, amphibian skin, choose the best answer.
chemicals