The pit that marks the location of the umbilical cord after birth is known as the navel or belly button. All animals that grow placenta during fetal development will have a navel or belly button. The scientific name of the structure is the umbillicus. It can be a depression in some individuals or raised in others.
Answer No 1:
The correct option is c) Both mitochondria and chloroplast contain DNA that is different from the nucleus.
Explanation:
The theory of endosymbiosis proposes that all the eukaryotic organisms have arisen from prokaryotes. This theory proposes that organelles such as DNA and nucleus were once prokaryotic cells. These smaller prokaryotic cells were engulfed by the larger prokaryotes which gave rise to eukaryotes eventually. These organelles possess their own DNA which is different from the DNA of the nucleus.
Answer No 2:
The correct option is C) aerobic organisms
Explanation:
The scientists propose that the initial conditions of the Earth were not favourable for supporting aerobic life. Scientists propose that photosynthetic organisms like cyanobacteria released oxygen into the environment which made the life of aerobic organisms possible on Earth.
Answer No 3:
The correct option is A) It proved the theory of spontaneous generation.
Explanation:
Spontaneous generation can be described as the generation of life from non-living things. Some scientists proposed that living organisms are formed by non-living things.
Answer:
"I will not salt my food, instead I'll use salt substitute."
Explanation:
Hyperkalemia may be defined as the medical condition in which the individual has high level of potassium in the body. This hyperkalemia can cause different diseases like cardiac arrest and can also cause death.
The hyperkalemia must be treated on time. The individual must be on low potassium diet. Avoid medicines that can increase the potassium levels and the administration of the sodium bicarbonates. The salt that has low potassium and high sodium concentration must be included in the diet.
Thus, the correct answer is option (b).
Infections are the tiniest and least complex life form known. They are 10 to 100 times littler than microbes (or bacteria).
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