Two functions of the skeleton system are:
- It is a support structure for the body
- It provides protection our internal organs
Answer:
Composition: mostly hydrogen and helium gas
Mass: 1.989 × 10³⁰ kg
Explanation:
Sun is a star at the center of the solar system. It is mostly composed of Hydrogen and Helium gases. Fusion of Hydrogen into Helium in the core powers the sun. Huge amount of heat and light energy is liberated. The mass of the Sun is 1.989 × 10³⁰ kg. Sun is a Population I star.
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.
