The absence of in the primitive atmosphere was essential to the origin of life on earth. n2 co2 ch4 o2

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .

(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only