As the number of children and adults being diagnosed with autism spectrum disorders (ASD) surges, what's needed are ...

Xylem cell They transport water and minerals up the stem to leaves and flowers. Dead cells are joined end to end to form a continuous tube. They have no cytoplasm. Their walls contain lignin for ...

This is called photosynthesis. The basic structure of a plant cell is shown below. Photosynthesis relies on many structures in the cell all working together, each playing its role. The diagram ...