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mart [117]
2 years ago
7

Approximately _____ elements occur naturally on earth.

Biology
2 answers:
zlopas [31]2 years ago
8 0

Answer: Till date 118 elements have been approximately 94 elements occur naturally on earth. Though some of the elements are present in very small quantities. The rest of the 24 elements in the periodic table are synthetic elements. There are almost 80 elements that have a stable isotope and 38 elements have radionucleides which means that they decay over a period of time.





FromTheMoon [43]2 years ago
3 0
<span>Of the 118 elements that have been discovered, 90 of them indisputably occur in nature. There is disagreement over whether four more or eight more occur naturally as a result of radioactive decay of other natural elements. The answer is, therefore, 94 or 98.</span>
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Human embryonic development is the development and formation of the human embryo. It is characterized by the process of cell div
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The statements that correctly describe gestation are: the normal period of gestation is about 40 weeks; the stages of this process include: zygote, blastocyst, embryo, and fetus; and changes to the form of the embryo come from differentiation and growth.

The gestation period in humans lasts about 40 weeks and comprises different stages and processes from conception until birth. The main stages of this process include:

  • Zygote: Fertilized ovum.
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Moreover, this process implies differentiation as cells specialize for specific functions, for example, muscle cells or nerve cells, and growth as the number of cells increases and therefore the embryo or fetus increases in size.

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2 years ago
Describe Lynn Margulis' three observations (evidence) which support the endosymbiotic<br> theory.
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There is quite a lot, but the fact that both mitochondria and chloroplasts have their own circular DNAis what I would call "key" evidence. That is, these organelles are not "manufactured" by the cell (i.e., there are no "genes for mitochondria" in eukaryote genomes): like their ancestral bacteria, they reproduce by binary fission.

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