An organic compound is one that contains the element carbon.
true or false

True.

Explanation:

Carbon is found in all living organisms. Here is a website.

https://education.jlab.org/qa/carbon_01.html

TRUE

Explanation:

I took the test

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer