If there are 1000 giraffes in a population and blurry spots (B) are dominant over crisp spots (b), how many crisp-spotted giraffes are there if the frequency of B is 0.8?

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

idk let me see fdfdgdg