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erica [24]
4 years ago
14

In which phylum do we first see tissue-level organization?

Biology
2 answers:
Sliva [168]4 years ago
4 0
Cnidarians were the first phylum that scientists saw tissue level organization in. Tissue level organization meaning cells all of one type start to function in a unified way.
statuscvo [17]4 years ago
3 0

Answer: The correct answer is- phylum- Cnidaria.

All living organisms are composed of building blocks termed as cells. Cells that perform similar functions are grouped together to form tissue.

The phylum where tissue-level of organization is seen first is Cnidaria. This phylum contains approximately 10,000 species ( such as jellyfish, sea anemones, corals).

Cnidarians have cells that are organized into two types of tissues, which occur in two layers. External tissue layer is ectoderm and inner tissue layer is endoderm.

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Fish are the cold-blooded creatures of God. Most of the fishes cannot control their internal body temperature by themselves just like human beings. In order to stay at a normal and a healthy temperature, or to obtain temperature homeostasis, the fish seek warmer or colder water for water retention when they face the excessive water loss.

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3 years ago
Dr. Haxton says the o-o bond is polar and the c-c bond is nonpolar. A good student would say ...
Serggg [28]

Dr. Haxton says the O-O bond is polar and the C-C bond is nonpolar. A good student would say ...

a.No, both bonds are highly polar.

b.Yes. O attracts electrons more strongly than C.

c.Right! O is electronegative, so O2 is polar.

d.Wrong again, Ralph. Both bonds are nonpolar. When two atoms of the same kind form a covalent bond, they share electrons equally because their electronegativity is the same.

e.No way. C is more electronegative than O.

Answer: d.Wrong again, Ralph. Both bonds are nonpolar. When two atoms of the same kind form a covalent bond, they share electrons equally because their electronegativity is the same.

Explanation:

Often when O and H are present in the substance at (opposite) ends (of the electronegativity scale), the polarity observed is very large, we can safely say the substance have a polar bond in it.

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