Which organelle converts the chemical energy stored in food into compounds that are more convenient for the cell to use?

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?

A5.00 g of a in . g of at aa 5.00 g of b in . g of .?at .