Beryl is shaped like a six-sided prism. beryl is part of the
a. isometric crystal system
b. monoclinic crystal system
c. hexagonal crystal system
d. triclinic crystal system

Option C, hexagonal crystal system

Explanation:

1. A  hexagonal crystal family has two crystal systems with in it . They are

a)  trigonal and

b) hexagonal

2.The smallest unit within an isometric crystal system has the shape of cube which is the  most common shapes of the crystals.

3. In monoclinic crystal system, the crystal have unequal vector lengths just like an orthorhombic system

4. Triclinic crystal system consists of unequal axes that are  inclined at nonperpendicular angles relative to each other.

Hence, option C is correct

b. the carbon cycle ensures living things have a source of hydrogen