Which statement highlights a unique role of water in a biological system? a. organisms cannot use it to regulate their body temperature. b. few organisms can use it as a living environment. c it does not provide structural support to organisms. d it provides organisms a medium to transport materials.

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Identify the terms using the following picture. principle of dominance item 1 can be described as the . item 2 can be described as the . the "p" represents from one parent.