Chemicals that bring messages to every part of the body are

Does indrect sunlight does not pose any danger to the skin

An _ exposure is a repeated or prolonged exposure(over months or years) that may bring about slowly developing symptoms.

Which practice is harmful to the land? a. using animal waste as fertilizer b. composting with peels from commercial fruit c. throwing paint cans in the garbage d. cutting the lawn with a gas-powered mower