Answer:
circulatory and respiratory
Explanation:
The circulatory and respiratory systems work together to give the body the oxygen it needs.
The answer would be an Ecologist
its B...
because a composite cell has a cell wall, vacuole, and cell membrane but doesnt include any of the plant cells so i know its B
Tundra ecosystem is cold and sunlight is short. Plants need sunglight and warmth in order to grow, thus plants in tundra are shorter and cloers to the ground since the ground is warmer than the air
The heaviest naturally occurring element is uranium.