Answer:
The marble moved 30 cm north in 6 seconds. is correct
Explanation:
according to K12
100% sure
Ir, Iridium has 77 electrons when neutral.
Neutrons or Neutral atoms
Neutral atoms of each element contain an equal number of protons and electrons. The number of protons determines an element's atomic number and is used to distinguish one element from another.
1,b
2,c
3,d
4,g
5a
6f
7,e
1,environment
2,community
3,ecosystem
4,organism
5,amniotic
6,biotic
7,population
