Dogs are derived from wolves. Today, dogs are very diverse, varying in size from very small to very large. What led to this variety 1 - selective breeding
2- cloning
3- Genetic Engineering
4- Natural Selection

Afamily is one another name for a group on the table of elements.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)