The average distance is 16,000 km
Converging rate is 10 cm/year
1 km = 100,000 cm
= 16,000 × 100,000/10 cm/year
= 160,000,000 years
It will then take 160 Million years to collide.
A membrane that allows only some materials to move in and out of the cell is B. Semipermeable.
Answer:
I believe the answer is a single bacteria cell.
