Most organisms breathe using oxygen or carbon dioxide. where do these gases come from on land?
air
offspring
homeostasis
shelter

Air.

Explanation:

Earth's atmosphere contains oxygen which humans breathe then creating the breathing cycle maintaining homeostasis. Homeostasis would be mistaken and is a trick answer.

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

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.