Answer:
a. 0.5 grams b. 0.25
Explanation:
Just use the half-life formula(I linked it below)
a. 4(1/2)^90/30=1/2
b. 4(1/2)^120/30=1/4
Answer:
A surface wave is a wave that moves along the interface of two different materials, like air and water.
Explanation:
False is the answer, hope this helped
In artificial selection, nature provided the variation, and human selected those variations that they found useful
It enters through the stoma.