The answer is that the criteria of classification change with the improved understanding of organisms around us. During the time of Aristotle, not much was known about the living organisms. So, he classified them as he observed. Plants were classified into herbs, shrubs and trees; very much like what’s taught to a second grade student. Animals as Enaima and Anaima based on the presence or absence of RBCs. After him, Carolus Linnaeus tried his hand over classification. He came up with the 2 kingdom classification: Plants and Animals. He considered only a set of morphological and physiological criteria to decide the kingdom to which an organism belongs. It includes presence of cell wall, mode of nutrition, contractile vacuole, locomotion and others. Based on these criteria, he included widely differing organisms into a single kingdom, for example, fungi, bacteria, algae, and higher plants were included into plant kingdom just because they have cell wall as a common aspect. Then came, Ernst Haeckel, who came with a third kingdom of Protista to include unicellular organisms. Copeland gave a 4 kingdom classification segregating unicellular organisms into 2 separate kingdoms based on their nuclear structure. R.H. Whittaker came next introducing the most accepted 5 kingdom classification system. You should understand one thing that man’s knowledge of classifying organisms improved with the improving technologies available to him, which he exploited to very effective extent. Carl Woese gave the 6 kingdom classification and 3 domain system based on the 16S rRNA sequence.
Our understanding of organisms around us is improving day by day and the system of classification will also change further in pace with the improvement in technology.
I hope this helps! :D]
~ Kana ^^
Answer:
The correct answer is option C. they amplify the original signal manyfold.
Explanation:
A phosphorylation cascade is a chain or sequence of the reactions that are categorized by the events where one enzyme phosphorylation another up-to phosphorylation of thousands of proteins.
The phosphorylation cascade can be experienced in involving the protein kinases as they the signal transduction of different cellular hormone messages due to their ability to amplify the original signal multiple time and make it more effective.
Thus, the correct answer is option C.
I want to say C. Aardvark, whale, hyena, dog, dolphin, and mole.
All of these mammals eat primarily meat.
B. is a close second, but the human and rat are both omnivores and don't regularly rely on meat for most of their dietary needs.
Allometric growth or the variation in growth pattern such that the mass or size of any body organ or part can be expressed relatively to the total mass or size of the entire organism. It also accounts for human infants having large heads crowning over their small bodies.
Answer: The correct answer is Parrot and Dog.
The animals which can maintain their body temperature by generating internal heat are called as warm-blooded animals or endotherms. They maintain constant temperature irrespective of the temperature in their surrounding.
These animals mainly include birds and mammals.
On the contrary, the cold-blooded animals ( ectotherms) are those, which absorb heat from surrounding and do not generate much of the internal heat. Their temperature fluctuates as the surrounding temperature changes. These animals include reptiles, amphibians, fishes, and invertebrates.
Thus, the correct answer is parrot ( bird) and Dog( mammal)