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maw [93]
2 years ago
7

Human embryonic development is the development and formation of the human embryo. It is characterized by the process of cell div

ision and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, the development of the human body entails growth from a one-celled zygote to an adult human being. Choose ALL of the statements that correctly describe stages in human embryology and gestation.
The normal period of gestation is about 40 weeks.

The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus in about 21 days.

The stages of human development include, in order: zygote, blastocyst, embryo, and fetus

A blastocyst, if untouched and allowed to remain implanted, will eventually develop into a morula.

Changes to the form of the embryo come from differentiation and growth.
Biology
1 answer:
iragen [17]2 years ago
3 0

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.
  • Blastocyst: Cluster of cells that is the result of the zygote going through cell division.
  • Embryo: Unborn human that is still developing, usually before the 8th week of gestation.
  • Fetus: Unborn human in development after the 8th week of gestation.

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.

Learn more about embryo in: brainly.com/question/1673695

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Answer:

B.getting only results that are scientific truths

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3 years ago
I don’t understand this. Please help.
Yanka [14]

Answer:

You have to categorize the fossils depending upon the type of fossilization process. Here are the answers; the explanation will help with further understanding the fossilization processes.

Permineralization:

A. Trilobite fossil

F. Trilobite fossil

B. Fossilized wood

Cast:

G. Fossil dung

Carbonization:

C. Fossil bee

I. Fossil fish

Impression:

D. Fossil brachiopods

Amber:

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Indirect impression:

E. Dinosaur track

G. Fossil dung

Explanation:

Permineralization:

The most common process of fossilization in which the remains of the organism, particularly, the internal cavities are replaced by the deposition of minerals carried by water or sediment.

Cast:

Casts are formed when the actual remains and bones of the organism are dissolved, creating a depression or a mould that gradually fills with sediments to form a cast of the exact shape of the original.

Carbonization:

The fossilization process in which only the residual carbon of the living organism remains leaving behind a thin carbon layer.

Impression:

Fossilization that involves the preservation of the prints or impressions of animals and plants when the print is made in silt or mud. This mud or silt hardens to rock.

Amber:

Amber is living organism preserved in fossilized tree resin.

Indirect Impression:

Indirect impressions are two dimensional imprints that do not contain any organic material from the organism itself but give a clue of its existence and biological activity. Footprints, tracks and excrement is fossilized in this manner.

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