Why do you think 02 levels rose dramatically and then fell after the Cambrian Explosion? a. Too many plants evolved and took away the oxygen from the atmosphere.

b. There was a large break up of supercontinent Rodinia. This released a lot of O2 into the atmosphere.

c. A meteor hit the Earth and cleared out all the oxygen.

d. So many new life forms were doing cellular respiration. This took in a lot of 2.

In sweet pea, gene c is responsible for color production and gene p is responsible for the purple color pigment. both of them are located on two different loci on different chromosomes. the flowers will be purple only when the plant has the genotypes as c_p_. no color will be produced with genotypes: ccpp, ccpp, ccpp, ccpp. thus, gene c controls the expression of gene p. what pattern of inheritance is exhibited here? a. pleiotropy b. epistasis c. multiple alleles