Since it has 4 protons, it must have an atomic number of 4. (That makes it beryllium.)
Since it has a 4 protons and 5 neutrons, it has a mass number of 9.
Answer:
The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
Explanation:
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A community is where a group of people live really close by vs. a population counts how many people live in a area
