Some complex multicellular organisms are organized at four levels to increase efficiency. what is the correct order of organization, from the simplest to the most complex? a. organ, tissue, cell, organ system b. cell, organ, organ system, tissue c. tissue, cell, organ system, organ d. cell, tissue, organ, organ system

Which of the following organisms are capable of self-fertilization? a.plants b.tigers c.humans

Polar zones are cold and tend to be dry because of a pressure system of cold. low high

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!