Answer:
Groundwater depletion
Explanation:
Aquifer depletion is responsible for the collapse of land called Groundwater depletion
A chemical change has occurred because the wood has turned into a substance that can't be changed back to it's original form. The wood has turned to ash, chemical changes are non reversible.
There are four total electrons to balance out the four protons
Answer:The correct answer is chordates
Explanation:
Organism in the phylum Chordata develop dorsal nerve cord in their embryonic stage. Development of dorsal nerve cord is the characteristic feature of these animals and is developed by the mesoderm layer. In many of them they are only present in embryonic stage.
In vertebrates notocord disappears after completion of embryonic stage and is replaced by vertebral column which provide support and anchor to the body structure of vertebrates.
Tunicates are chordates and have dorsal nerve cord only in prenatal stage and it disappears in adults.
