The number of males and females of each age group in a certain population is called

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit

Omg substrates with the same size and shape as the active site will bind to the enzyme. why is the key labeled the “bad” substrate?