13-13= 0, 19-13= 6, so then 0-6= -6
The DNA has to replicate before mitosis to keep the number of chromosomes consistent. Hope this helps.
Answer:
The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. ... These powerful currents cause lines of invisible force to stretch around the Earth and thousands of miles into space, creating a magnetic field.
Answer:
I think B
Explanation:
Because it is not a physical weathering example, it is not based on the weather it is based on a growing plant.
A. Consumers cannot produce their own food source so they have to eat other animals.
C. Rhizobia bacteria "prepare" the atmospheric nitrogen and make it useful for the plant.
Hope it helped,
Happy homework/ study/ exam!
