To investigate the pathways involved in synthesis of the amino acids phenylalanine and tyrosine in yeast, mutants were generated that were unable to grow on minimal media lacking one of these amino acids. a. True
b. False

it is a learned trait

explanation:

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.