The fossil record shows that a type of aquatic arthropod arose 505'440 million years ago and is now extinct. which of today's animals might that ancient organism most resemble?

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

answer///malignant melanoma;