Explanation:
electrovalent bond covers single bond.
Covalent bond covers double or more bonds.
Answer:
D
Explanation:
The source of the thermal energy in a combustion engine is the spark from the spark plug that ignites the fuel and air mixture converting chemical energy into thermal energy.
Animal cells have a centrosome and lysosomes, whereas plant cells do not.
Answer:
Because it gives them a full valence shell.
Explanation:
