If three half lives have passed since a scientist collected 100 grams of sodium 24 , how much Na-24 is left now? 0 grams
24 grams
50 grams
12.5 grams
100 grams

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.

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