Iron because of its presence in haemoglobin, binding with oxygen to form oxyhaemoglobin.


Alternating current (AC) and direct current (DC) are notable for inspiring the name of an iconic metal band, but they also happen to sit right at the center of the modern world as we know it. AC and DC are different types of voltage or current used for the conduction and transmission of electrical energy.
Electrical current is the flow of charged particles, or specifically in the case of AC and DC, the flow of electrons. According to Karl K. Berggren, professor of electrical engineering at MIT, the fundamental difference between AC and DC is the direction of flow. DC is constant and moves in one direction.
Answer:
from a person/animal/etc
Explanation:
you cant apply force from a rope or from the friction of an objects motion so the answer is B
Answer:
im not sure but i think it is (a thick layer of permafrost ) sorry if im wrong
Explanation: