The deuterostome group's gene arrangement in the mitochondrial genome of <em>Xenoturbella bocki </em>is remarkably close to that of the chordates and hemichordates and hence to the ancestor deuterostome gene order. Inversion and breakpoint studies particularly point to a similarity to the hemichordates.
Previous morphological investigations imply that Xenoturbella could be classified as a bivalve mollusc, a basal bilaterian, a turbellarian flatworm, a sister group to the echinoderms(nonvertebrate), or a hemichordate. Recent genetic analyses that focus mostly on nuclear genes appear to favour the Ambulacraria (echinoderms + hemichordates). In contrast, a basal deuterostome location is supported by mitochondrial sequences.
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<u>Thermohaline</u> is a large scale ocean water circulation driven by density differences due to the changes in surface water temperatures and fresh water fluxes.
Explanation:
Thermohaline circulation is the ocean circulation driven by variation in ocean densities. The deep ocean currents are influenced variations in the temperature controlled water density (thermo) and the salinity (haline) of the ocean waters. This circulation happens due to the thermal and haline influences on the ocean waters.
Due to extremely cold water, the ocean waters in the Earth’s polar region gets very cold and forms sea ice leaving salt behind. This decreases sea water temperature but increases the salinity levels.
With increase in salinity, the density of the water also increases which makes the water heavy and sink and the surface water moves in to fill the sunken sea water.
Again this surface water also becomes cold and the cycle continues leading the global ocean conveyor belt and causes freshwater fluxes depending upon the latitude of the ocean.
Answer:
Grasshopper has open circulatory system.
Explanation:
Grasshopper has open circulatory system and they have a fluid cavities called haemolymph. Grasshopper have open circulatory system because the blood is not usually in the blood vessels. The hearts like structure pump the blood into the aorta and the blood flow from aorta in the body fluid, called haemolymph. The heart like structure is located in the upper part of the abdomen and pump fluid to the head and passes through organs and tissues.
Answer:
Sunlight
Explanation:
Abiotic means not alive, and the insects and fish options are alive, so we can eliminate those. Sunlight and rocks are left. Of these, the rock would not affect the water lilies, not as much as sunlight at least. Without sunlight, the water lilies would not be able to grow and thrive as all plants/flowers have sunlight as one of their basic needs, so sunlight must be the answer.