Answer:

Explanation:
Let
x ----> the surface area of a sphere
y ---> the volume of a sphere
we know that
The ratio of surface area to volume of a sphere is equal to divide the surface area by the volume of the sphere

we have

substitute the values

Homologous
The fins of fishes and flipper of a whale are homologous structures since they have different structure but similar structure
Answer:
Recycling paper uses 60% less energy than making paper from raw materials. Every ton of recycled paper saves:
· 4,100 kWh of electricity
· 380 gallons of oil
· 4.6 cubic yards of landfill space
· 7,000 gallons of water; and
· 17 trees
Explanation:
The main function of the smooth ER is to make hormones and lipids.