Answer to Question #211971 in Civil and Environmental Engineering for Nickname.

Question

1. You have been provided with a tray with two rugose corals; a Cystiphyllum and a Heliophylum.How will you distinguish between the two?
2. How did the muscle scar in the bivalve Pectenevolve?
3. Why is the tests of the microspheric individual of the foraminifera fewer or uncommon to that of the megalospheric form?

Answer 1

1.Cycadeoidea is a plant while Heliophyllum is animal. Cycadeoidea resembled modern cycads. They possessed a squat bulbous or branched trunk covered in sturdy leaf bases and scales that protected the woody stem within while the Heliophyllum anterior incisors are separated from the complicated cheek teeth by a pronounced gap; the cheek teeth possess two to four rows of cusps arranged longitudinally. In features of skull construction and general overall skeletal construction the tritylodonts closely approached true mammals, though they were too specialized to have given rise to the mammals and may have been contemporary with some of the earliest of them or is characterized by a large, upright, sail-like structure on its back.

2.Bivalves have also been proposed to have evolved from the rostroconchs. Bivalve fossils can be formed when the sediment in which the shells are buried hardens into rock. Often, the impression made by the valves remains as the fossil rather than the valves.

3.Foraminifera with hard tests are scarce until the Devonian, during which period the fusulinids began to flourish culminating in the complex fusulinid tests of the late Carboniferous and Permian times; the fusulinids died out at the end of the Palaeozoic.