Answer:
Hard
Explanation:
it is hard because these are usually hard parts of an organism including shells, bones, teeth, woody trunk, stems, and branches.
A) toward the earth ...hope this hlep
U caint see the answers sorry
The substance must be able to alter its physical characteristic (for example, its color) in accordance to a change in pH. One example of this is litmus paper, which becomes red under acidic conditions and blue under basic conditions.
A. xx
b.x+x+
c.x0x0
d.x+x0
e. x0y
