how does tourism and over hunting affect the populations of the Australian Freshwater Crocodile (Crocodylus Johnstoni) ???

Answer: The correct answer for the fill in the blank is A) Circulatory, immune.

Circulatory system also called cardiovascular system is a vast network of organs and vessels that allow the circulation of blood so as to transport nutrients, oxygen, other gases, and hormones to different parts of the body.

Blood contains different cells like white blood cells, red blood cells, platelets.

White blood cells ( also called leukocytes) work closely with immune system. They provide defense against pathogen ( disease causing organisms) through various ways ( like ingesting foreign material, producing antibodies to clear the antigens). By doing so, they protect us from infection and disease.

The movement of sediments could cause problems because building on unstable ground will cause the structure to sink or settle.

What are sediments?

A solidmaterial that has been transferred and dumped in a new area is known as sediment. Rocks, minerals, and animal and plant remnants can all be found in sediment. It can range in size from a rock to a single sand particle.

Through the process of erosion, sediment is transferred from one location to another. The removal and transporting of rock or soil is erosion. Sediment can be transported by erosion by water, ice, or wind.

Water can carry debris, such as gravel or pebbles, from a creek into a river and ultimately to the delta of that river. The bottom of waterfalls, river banks, and deltas are typical places where silt gathers.

As the ice chisels or melts, glaciers may freeze sediment and then dump it somewhere else. Moraine is the name for the sediment that glaciers produce and deposit.

In sandstorms or dust storms, wind may transport dirt over a plain. The stony material that makes up sand dunes is eroded by wind and sand particle impact.

Because it frequentlynourishes the soil with nutrients, sediment is significant. Sediment-rich regions are frequently also biodiverse. For farming, sedimentary soil is often preferable. The most productive agricultural regions in a region are frequently the deltas and river banks, where abundant silt is deposited.

Therefore, building on unstableground will cause the structure to sink or settle.

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Any of a subphylum (Vertebrata) of chordates consisting of animals (such as mammals, birds, reptiles, amphibians, and fishes) with a bony or cartilaginous spinal column that replaces the notochord.

The vertebrates are frogs and fish.

What are the characteristics of vertebrates?

• The anatomy of vertebrates is strikingly similar, with the presence of a vertebral column, gastrointestinal tract, and spinal cord.

• The notochord develops into a vertebral column, with the vertebrae on the dorsal side.

• The presence of the central nervous system is an important indicator. The spinal cord's anterior nerve tube expands into the brain.

• Jaws can be found in some vertebrates. Jawless species are included in the order of vertebrates.

• The internal skeleton facilitates the distribution of various muscle attachment nodes.

Why frogs and fishes are vertebrates?

• Frogs and fish are both members of the phylum Chordata and the subphylum Vertebrata.

• Frogs and fish, like humans, have a spinalcord and a backbone.

• Furthermore, all chordates have bilateralsymmetry.

Thus, we can conclude that Options B and D are correct.

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