give reason an Empty bottle floats on the surface of a water while a bottle filled with water flows inside the liquid​

The empty plastic bottle floated on water. The bottle filled with water sank because the weight of empty plastic bottle is less than the weight of water displaced it but when the bottle is filled with water its weight becomes more than the weight of water displaced by it.

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organisms that are both used in toothpaste as well as cause malaria are protista and monera.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).