Under a microscope how do u determine a specimen is living

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what