Answer:
1 half life, two half lifes to equal 25 atoms left
The 1 half life gets the amount of atoms to 50
2 half lifes gets the amount of atoms to 25.
Half life takes the amount of substance and halves it every certain amount of years.
Answer:
The blood vessel from lungs to heart is pulmonary vein which carries oxygenated blood.
Answer:
Taxonomy
Explanation:
Taxonomy is the science of naming, defining and classifying groups of biological organisms on the basis of shared characteristics.
The principal ranks in modern use are domain, kingdom, phylum, class, order, family, genus and specie
Answer:
A. the population must be very large