Answer:
1. C. Ecosystem
Explanation:
An ecosystem consist of living and nonliving things
The DNA is condensed before replication in the form of chromosomes and then the chromosomes are divided.
Answer:
The number of electrons in an atom's outermost valence shell governs its bonding behaviour. Elements whose atoms have the same number of valence electrons are grouped together in the Periodic Table. ... To form a covalent bond, one electron from the halogen and one electron from another atom form a shared pair.