Which term describes a group of interacting populations that occupy the same area at the same time? Multiple choice question. abiotic factor ecosystem niche community

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

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.