Observable characteristics in organisms are known as

genes
genotype
traits
dna

The chromosomal structure that limits the number of cell divisions of a cell is the the chromosomal structure that limits the number of cell divisions of a cell is the kinetochore telomere histones centromere

Which organ controls breathing? lungs alveoli heart diaphragm

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down