Three different types of inks are used in this experiment. The ink are black, red and green in colour. During the course of the experiment, the black ink changes colour from light blue to dark blue and then to red. The red ink changes color from red to pink. The green ink changes colour from dark blue to green and then to yellow.
The answer is B. Bacteria blooms and decreased underwater photosynthesis causes asphyxia, killing the fish.
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Answer:
The plant types suitable during that period would be ferns, horsetails, and lycopods.
Explanation:
A geologic period and system, which covers 60 million years from the termination of the Devonian period to the start of the Permian period is known as the Carboniferous period. During the Carboniferous period, the plant life was luxuriant and extensive, mainly at the time of Pennsylvanian. It comprises ferns and fernlike trees, that is, the giant horsetails known as club mosses, calamites, or lycopods like Sigillaria and Lepidodendron.
Thus, if humans had been present to construct log structures during the Carboniferous period, then they would have used logs of ferns, horsetails, and lycopods for construction work.
