A scientist is creating a new synthetic material. The material's density is 6.1 g/cm3. Which sentences describe how the scientist can lower th material's density?
The scientist can decrease the mass while keeping the volume constant.
O The scientist can increase the mass while keeping the volume constant.
O The scientist can decrease the volume while keeping the mass constant.
The
scientist can increase the volume while keeping the mass constant.

This bacteria must be very strong as it has a large amount on antibiotic targeting it. this bacteria could be one of many different types and it is very hard to tell which one with out more information.

The casefor proofs

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

The correct answer is a