Answer:
They developed during the Cambrian time period, which was around 530 million years ago.
Explanation:
Hope this Helps!
<span>B. a ship slowly sinking</span>
This is not balanced
Protons are positively charged and neutrons are neutral whereas electrons are negatively charged.
Answer:
(B) tightly packed protons and neutrons
Explanation:
- Nucleus of any atom is the dense central part of any atom.
- It consists of two sub-atomic particle namely proton and neutron.
- These sub-atomic parts are tightly packed in nucleus which makes the nucleus dense .
- This dense nucleus is responsible for most of the mass of atom.
- The atomic mass for any atom is decided by sum of the mass of proton and neutron
Thus, correct answer is
(B) tightly packed protons and neutrons
