In a laboratory, a student combines vinegar and baking soda into a beaker. The initial temperature is 28 degrees Celsius and the final temperature reading two minutes later is 20 degrees Celsius. What happened to the heat in the surroundings?
Did an endothermic or exothermic reaction occur?

answer; ///(b) it is composed of four protein chains and four heme groups;

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

cells spend most of their time in interphase