Which of the following animals does not lay eggs? Spiny anteater Robin Leopard Frog

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?

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

Several billion years ago which gas was the least prevailant in the atmosphere