Pueden las teorias cienficas sobre el origen de la vida apoyar la idea de que la vida puede aparace en otro planeta

Which group of chordates does  notpossess true backbones?                 a.  birds      b.  frogs and toads      c.  lampreys      d.  crocodilians

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes