Why does a tadpole reabsorb its tail into its body?

The cells failed to grow.

The cells were programmed to die.

The cells were diseased.

The cells mutated.

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.