The answer is D all of the above
True, Chordates are animals in Phylum Chordata.Chordates include all of the vertebrates, in which the notochord develops into a backbone, as well as some invertebrates. Invertebrate chordates include tunicates and lancelets.
When a candle burns, both physical and chemical changes occur. ... So, the melting of wax and vapourisation of melted wax are physical changes. Chemical Changes : The wax near flame burns and gives new substances like carbon dioxide, carbon soot, water vapour, heat and light.
When a candle burns, the oxygen in the air reacts and forms carbon dioxide. A new substance, the CO2 is formed. So it is a chemical change. When the candle melts, no new substance is formed and the molten wax can be again solidified and made into a candle and it is a reversible change.
The correct answer is that Earthworms hold a closed category of circulatory system. <span>The earthworms circulates blood </span>solely through<span> their blood vessels. There are </span>three major<span> vessels that </span>deliver<span> the blood to the organs of </span>the <span>earthworm, </span>those<span> vessels are known to be the aortic arches, dorsal blood vessels, and ventral blood vessels.</span>