Answer: Only eukaryotic organisms have DNA.
Answer:
The thoracic and sacral curvatures of the vertebral column are <u>convex</u> while the cervical and lumbar curvatures are <u>concave.</u>
Pioneer species are often hardy plants with Adaptations such as long roots, root nodes containing nitrogen-fixing bacteria, and leaves that employ transpiration.
Young animals are very small, the oxygen easily diffuse inside their bodies, plus due to the small size they need little amount of oxygen to maintain body functioning. Larger animals need more oxygen to live and simple diffusion is no longer sufficient. Gills extend body surface in highly vesseled regions and that makes the diffusion a lot more efficient.
Hope this helps...answer's in the photo :')
