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).
which class question is this?
Answer:
Gram positive bacteria have cell walls composed of thick layers of peptidoglycan. Gram positive cells stain purple when subjected to a Gram stain procedure. Gram negative bacteria have cell walls with a thin layer of peptidoglycan.
transport, digestion, absorption, elimination
Answer:
the answer b adrenal glands common knowledge
Answer:
human water has to be filtered and cleaned because it contained many chemical and bacteria animal water can be filtered but anilmals will drink out of a slightly dirty container since they have stronger immune systems
Explanation:
