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3 years ago

A human embryo doesn't need the kind of yolk that is present in a chick embryo. Explain.

2 answers:

8 0

The yolk of an egg is the food and nutrient source for the chick as it grows, humans do not need this because they get all of the nutrients they need for development from the mother through the umbilical cord.

Vladimir [108]3 years ago

6 0

Answer:

The egg yolk of a chicken corresponds to the female's oocyte II, which would become a chick if fertilized by a male gamete. The yolk have the nutrients that provide the energy for embryo development. In the case of humans and other animals called eutheries or placentals, embryos are fed through an organ called placenta, which connects the embryonic organism with mother's organism. Thus, there is no need for a type of "yolk" to provide the embryo with energy, as is the case with chickens and other animal species in which embryonic development occurs without direct attachment to the maternal organism.

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The hormone ________ promotes sexual desire in both males and females.

goldenfox [79]

The hormone testosterone promotes sexual desires in both males and females

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2 years ago

The american medical association recommends which step(s) to a physician on how to terminate a relationship with a patient?

harina [27]

Once, a physician accept to treat a patient, their relationship will continue to exist until the patient no longer needs the physician, then the relationship will end naturally. But in a situation where the relationship has to come to an untimely end, the physician must avoid abandonment claim by giving sufficient notice of withdrawal to the patient, relatives or responsible friends and guardians of his patient in order to secure another physician.

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3 years ago

What is the indicator we are using in this titration? In your own words, what is the purpose of grinding the spirulina? Should t

AveGali [126]

Answer:

What is the indicator we are using in this titration?

a deep blue indicator

Explanation:

What is the indicator we are using in this titration?

a deep blue indicator

the purpose of grinding the spirulina is to be able to break the cell into smaller particles that can dissolve well in a solution.

when powder spirulina is mixed with silica the cells are easily break even.

Should the ground silica and spirulina mixture be suspended in deionized water, exhibit water, or buffer? Why?

ground silica and spirulina mixture be suspended in deionized water because its dissolved and mixed well in water than any other solvent.

What is the color of the folded phytobilliprotein with the bound cofactor?

A blue color is observed when phytobilliprotein is folded.

How do you expect it to change as you add acid or base?

when a base solvent is use for the solution of silica and spirulina (e.g of base NaOH) is used, the colour obseved will be pale yellow or green color.

when a acidic solvent is use for the solution of silica and spirulina (e.g of base HCL) is used, the colour obseved will be colorless solution.

When a base and acidic solvent is used, it causes a changed in the charge state of the protein and changes the interaction thereby causing unfolding.

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3 years ago

Scientists developed the ________ model after their studies of the fossil record revealed that some species appear quite suddenl

tatuchka [14]

Answer:

Punctuated Equilibrium

Explanation:

The phyletic gradualism model and the punctuated equilibrium are aspects models of macroevolution that are characterised with varying patterns.

However, the punctuated equilibrium model of evolutionary history consists of geologically long periods of inactivity (stasis) with little or no evolution, interrupted or "punctuated" by geologically short periods of rapid evolution.

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3 years ago

What is the meaning of the phrase "individual transcendence" as used in the following sentence?

Romashka [77]

I believe the answer would be B

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2 years ago