1: True
2: True
3: False
4: False
(Question 2 might not be true, not sure)
Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
C. Spacecraft are built to be airtight.
Personal experience from Ag Mech classes-Concrete cools faster than metal.
The study of plants, plant life cycles, photosynthesis, plant parts, etc. is under botany (study of plants).
