The three-domain system is a biological classification introduced by Carl Woese et al.in 1977[1][2] that divides cellular life forms into archaea, bacteria, and eukaryote domains. In particular, it emphasizes the separation of prokaryotes into two groups, originally called Eubacteria (now Bacteria) and Archaebacteria(now Archaea). Woese argued that, on the basis of differences in 16S rRNA genes, these two groups and the eukaryotes each arose separately from an ancestor with poorly developed genetic machinery, often called a progenote. To reflect these primary lines of descent, he treated each as a domain, divided into several different kingdoms. Woese initially used the term "kingdom" to refer to the three primary phylogenic groupings, and this nomenclature was widely used until the term "domain" was adopted in 1990.[2]
Parts of the three-domain theory have been challenged by scientists such as Radhey Gupta, who argues that the primary division within prokaryotes should be between those surrounded by a single membrane, and those with two membranes.
Answer:
what is the total number of vertebra in human body?
<em>➢</em><em> </em><em>33 </em><em>vertebrae,</em><em> </em><em>In humans, the vertebral column usually consists of 33 vertebrae, placed in series and connected by ligaments and intervertebral discs. However, the number of vertebrae can vary between 32 and 35. Usually there are 7 cervical, 12 thoracic, 5 lumbar, 5 sacral and 4 caudal (coccygeal) vertebrae.</em>
Explanation:
<em>I </em><em>hope</em><em> it</em><em> will</em><em> help</em><em> you</em><em>.</em><em>.</em><em>.</em><em>.</em>
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<em>#</em><em>c</em><em>a</em><em>r</em><em>r</em><em>y</em><em>o</em><em>n</em><em>learning</em>
Answer:
The food adulterants and the chemical compound present in the food are harmful for the living organisms. The junk food increases the chances of obesity and health related disease.
The humans knows that the smoking and excess drinking of coca cola can cause harmful effect in their body. But this is human psychology that the knowing about the harmful effect of a particular substance cannot change the drinking or eating behavior of an individual.
Answer:
c) Feel the closed door with the back of the hand, from the bottom up
Explanation:
The Community Emergency Response Team is a team that is in charge of helping the community in case of emergencies and know how to act in case of all the casualties that can occur, when a member or a CERT is searching for survivors in a building after an electrical storm, he should check and feel the closed door with the back of his hand from the bottom up to see if it is hot, or if there is fire inside.
Answer:
B. Nutritionist
Explanation:
Calories are a unit for the measurement of the amount of energy in different foods and drinks.
Pharmacists are responsible for the distribution of medication, which is not measured in calories so it is not A.
X-ray technician organise X-rays which scan the insides of people's bodies (most commonly bones) so they do not use calories.
Finally life technicians identify and collect loving organisms to study so they don't use calories either.
A nutritionist's is to evaluate the chemical make up of different foods i.e. How much energy hence calories, and how they work with different people's bodies, therefore B is correct.
Hope this helped!
