Answer to Question #211953 in Civil and Environmental Engineering for Panda

Question

1. Name two structures found in sedimentary rocks that are indications of trace fossils. 
2. Within the various habitats that comprise the marine ecosystem, all organisms fall into three categories. Name these categories ​​​
3. Corals are not found growing at the mouth of a river even though the water is warm with ample nutrients. Why are the corals absent from this environment?

Answer 1

Part 1

Biogenic sedimentary structures (trace fossils or ichnofossils) are biologically generated structures that include organism-made tracks, trails, burrows, borings, fecal pellets, and other traces.

Part 2

Three main groups of ocean life are plankton, nekton, and benthos.

Part 3

Corals must develop in shallow water where sunlight may reach them.

Clearwater: Corals require clear water that allows sunlight to pass through; they do not survive in opaque water.

The temperature of the warm water: Warm water temperatures are required for reef-building corals to survive.