The first diagram is the alpha helix, which is a spiral shape.
The second diagram is the beta pleated sheet which is the folded paper shape
Answer:
The calcium concentration must be greater OUTSIDE
the cell than INSIDE the cell.
Explanation:
Calcium has a vital role in the body, it is necessary for:
- exocytosis
- muscle contraction
- normal excitability of neurons
- blood coagulation
- building and maintaining bones and teeth
- enzymatic activity
Bivalves are protostomes, as they belong the to phyla Protostomia. They are freshwater/marine molluscs, whose body is covered by a protecting shell. They do not have a head, and some of their examples include oysters, clams, mussels etc.
