Select all of the following that are true associations in the heart (multiple answers possible). -the atria and ventricles contract simultaneously
-the semilunar valves are secured via chordae tendineae
-the left ventricle pumps blood out to the systemic circuit
-the right ventricle receives deoxygenated blood from the atrium through the tricuspid valve
-the atria pump blood away from the heart, while the ventricles pump blood into the heart

The graph below compares the rates of reaction of a burning candle and an exploding firework. comparing chemical reactions what can you conclude from the graph? the reaction that causes a firework to explode requires less energy to start, and occurs more rapidly than the reaction that causes a candle to burn. the reaction that causes a firework to explode requires less energy to start, and occurs less rapidly than the reaction that causes a candle to burn. the reaction that causes a firework to explode requires more energy to start, and occurs less rapidly than the reaction that causes a candle to burn. the reaction that causes a firework to explode requires more energy to start, and occurs more rapidly than the reaction that causes a candle to burn. mark this and return

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.