Explain how animals in vertebrata are classified in to further subgroups.

vertebrates are further classified  in to subgroups on the basis of many conditions

1. on the basis of weather

  warm blooded and cold blooded

2. on the basis of skeleton

exoskeleton and exoskeleton

3.  on the basis of way of taking oxygen (respiratory organs.)

either through skin, gills or lungs

4. Number of chambers in heart.

5. The method of reproduction

on the basis of above criteria, vertebrates are divided in to many classes.

1) Pisces (fishes)-

have exoskeleton heart is 2 chambered respiration through gills

2) Amphibia

slimy skinheart is 3 chambered respiration through gill in larvas

3) Reptilia-

exoskeleton heart is 3 chambered laying under water eggs

4) Aves (birds)-

heart is 4 chambered eggs laying

5) Mammalia-

have exoskeleton heart is 4 chambered give birth to young baby

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.