Answer:
1. A
2. C
3. C
Explanation:
1. there are single cell organisms
2. all others are abiotic factors
3. individual is just one, population is one species, community is all populations, ecosystem includes abiotic and biotic factors, biome is a large geographical area.
If a carbon atom can form four covalent bonds, it also has four valence electrons. For neutral atoms, the number of valence electrons the same as an atom's main group number.
Answer:
No
Explanation:
The first 2 electrons are in the inner shell, and the other 6 are valence electrons. Oxygen needs 2 more electrons to fill its valence shell and satisfy the octet rule.
PH = -log [H+]
pH = -log (1.0x10^-4) = -(-4) = 4 or A
Answer:B or C
Explanation: when a scientist forms a hypothesis he or she usually makes an prediction or a statement about what will happen next in an sequence of events
