Choose the answer that best describes a constellation. 1. Groupings of stars with mythological names and recognizable patterns
2. The counter-clockwise movement of the Earth through the night sky
3. A map of the Milky Way galaxy
4. Star clusters that are gravitationally connected
please do not add links ^^

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.