HELP ME PLEASE ILL GIVE IF U GET IT RIGHT PLEASE

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

Below are the three main organs that make up the plant body. what is the main function of the structure that is identified as b in the picture above? it anchors the plant.it produces food.it absorbs nutrients.it supports the plan

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?