The ridge of a birds breastbone is called a keel
Cooler and even the place in which it is is going to be more humid.
<span>The correct answer is the nucleus and the cell wall. Cell walls and Nucleus are only found in specific cells. Prokaryotic cells are cells that do not have definite nucleus in their cells, while Animal Cells do not have cell walls, yet the Plant Cells have cell walls.</span>
