A400-gram sample of a radioactive nuclide is left to decay for 30 hours. at the end of 30 hours, only 200 grams of the sample is left. what is the half-life of the nuclide sample

a) 10 hours
b)1.5 days
c) 30 hours
d) 0.5 hours

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Pls the table below shows the role of different substances during photosynthesis. substance role during photosynthesis glucose stores chemical energy water combines with glucose to form carbon dioxide chlorophyll traps sunlight which of the following statements would correct one of the roles listed in the table? glucose combines with carbon to form water. chlorophyll reacts with light to produce carbon dioxide. water combines with carbon dioxide during photosynthesis. chlorophyll stores chemical energy needed for photosynthesis.

The united states uses which source of energy to produce almost 40 percent of its electricity