The KT boundary marks a mass extinction event. the KT boundary is the time between the Cretaceous and Tertiary periods. An asteroid hit the earth at the end of the Cretaceous and that caused the end of the Cretaceous period. Before the KT boundary, pollen from angiosperms and gymnosperms is high. After the meteor hits the earth, a mass extinction occurs and the amount of pollen from gymnosperms and angiosperms decreases dramatically, while the amount of spores from ferns increases. During the Cretaceous period there were many species of gymnosperms and angiosperms but they disappeared at the KT boundary, when the asteroid hit the earth.
Answer:
<em> It explains how nature works.</em>
Explanation:
A scientific theory can be described as a descriptive explanation of the occurrence of any phenomenon taking place in the natural world. Other statements are not true because a scientific theory is explained best with the help of certain experiments and certain known facts. It might be based on results from many experiments and supported through many known facts. A scientific theory has the capacity to replicate its results when performed again and again.
Answer:
D
Explanation:
The water molecules in the cell will want to move out of the cell into the pond in attempt to lower the salt concentration which will cause the cells to shrivel up with the loss of water. This is also called becoming hypertonic.
The one who developed the culturing technique to enrich for a certain population of microbial cells from a complex community based on a particular metabolic phenotype of interest is Martinus Beijerinck. The correct option is C.
<h3>What is culturing technique?</h3>
Culture methods involve collecting samples from the field and culturing them to detect the presence of microbes.
The number of microbial species and their influence on corrosion are estimated. Culture media for various microbes have been established.
Culturing is simply the process of growing microorganisms in special media in the laboratory. It entails the preparation of sterile medium, as well as the inoculation, incubation, and examination of microorganisms.
Martinus Beijerinck invented the technique for enriching a specific population of microbial cells from a complex community based on a specific metabolic phenotype of interest.
Thus, the correct option is C.
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Your question seems incomplete, the missing options are:
A. Frederick Griffith
B. Joseph Lister
C. Martinus Beijerinck
D. Sergei Winogradsky
