Heat absorbing (endothermic) reactions have an increased temperature once the reaction occurs. If it is exothermic the temperature of the substance itself decreases and it gives off heat.
Answer:
A compound is a molecule made of atoms from different elements.
Explanation:
All compounds are molecules, but not all molecules are compounds.There are two main types of chemical bonds that hold atoms together: covalent and ionic/electrovalent bonds. Atoms that share electrons in a chemical bond have covalent bonds. They make up compunds because they can join togther .
ANSWER : have a specific shape related to their specific function
<span>A. Structures developed that protecting developing eggs and sperms
[ 'cause of their protection, they get produce in very high number ]
Hope this helps!</span>
