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sveticcg [70]
3 years ago
11

In an eight-cell embryo of an organism, the cells of the upper tier are aligned over the cells of the lower tier at a slight ang

le. Which organism is it likely to be? The choices are the following: Earthworm. . . . Starfish. . . . Sea cucumber. . . . Sea urchin.
Biology
2 answers:
morpeh [17]3 years ago
8 0
<span>I think the correct answer among the choices listed above is option C. The organism described most likely is a starfish. This is because annelids and mollusks exhibit spiral holoblastic cleavage while the echinoderms have radial holoblastic cleavage.</span>
DochEvi [55]3 years ago
4 0

Answer:

Earthworm

Explanation:

Star fish, sea urchin and sea cucumber are echinoderms and exhibit radial cleavage.  The two tiers of cells of their eight cell embryo are aligned directly over each other. Earthworms are annelids and exhibit spiral cleavage during embryonic development in which upper tier of cells made an angle with cells of lower tier in eight celled embryo.

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You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile, using many short extensions of
Lilit [14]

Answer: C) ciliates.

Explanation: Ciliates possess two different nuclei a diploid micronucleus which carry the germline of the cell. It also has a large, polyploid macronucleus which can be termed the vegetative nucleus, it takes care of general cell regulation, it expresses the phenotype of the organism. The macronucleus is generated from the micronucleus. The micronucleus passes the genetic material to offspring, but it does not express its genes. The macronucleus provides the small nuclear RNA for vegetative growth.

3 0
3 years ago
Read 2 more answers
Why does putting your name on a health behavior contract indicate your commitment to the contract?
dimulka [17.4K]
Because it is written. A popular tool used for motivation and commitment is the use of written contracts and often does not even need to be as lengthy as a contract. A slip of paper or even another writing surface has been shown to significantly increase the likelihood of committing to that action. 

There is also premeditation involved when signing a contract or writing on a piece of paper. An individual has read and recognized the written words and then signed it according to a commitment to that act. As such there is a significant amount of thought put into the over procedure, and thus increases again the likelihood of an individual to be committed to completing those actions.

Aside from all the factors of motivation, the signing demonstrates commitment to the contract because that is fairly universally understood to be the way in which people recognize and formally commit to contracts. Whatever the context of the action, whether signing papers to buy a house or for a new job, the signing of the contract is the commitment of the individuals involved to complete the requirements within the contract. Although in this instance the healthier behavior most directly affects the individual who signs the paper.


7 0
3 years ago
The navel is located in the ________ region of the abdominopelvic cavity.
Sholpan [36]

The abdominopelvic is composed of the abdominal cavity and the pelvic cavity. This cavity contains the organs such as liver, stomach, spleen, gallbladder, pancreas, kidney and most of the intestines along with the internal reproductive organs and urinary tract. The navel is located in the umbilical region of the abdominopelvic cavity.

Hence, the blank can be filled with 'umbilical region'.

6 0
3 years ago
A small sac that lubricates the area around the elbow, knee, or shoulder joint where friction is most likely to occur is known a
Licemer1 [7]
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8 0
3 years ago
Active transport requires _E_ __ __ __ __ __ to move molecules across
denpristay [2]

Answer:

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Explanation:

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration. Cellular energy is required to acheive this movement.

Hope this helps you!

5 0
2 years ago
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