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Lemur [1.5K]
3 years ago
9

What is the difference between bottom-up and top-down controls in ecosystems?

Biology
1 answer:
NARA [144]3 years ago
5 0

Answer:

A bottom-up system concentrates attention on how resources (space and nutrients) influence higher trophic forms , whereas a top-down system focuses on interactions at top level consumers (predators) and their prey influence on lower trophic forms.

Explanation:

hope it helps you  !

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33. Why is the amniotic egg such an important derived characteristic of amniotes? Be sure to give 3 characteristics of an amniot
katovenus [111]

The another are differentiated from the anamniotes by the presence of their terrestrially adapted eggs. These eggs are protected by amniotic membranes. Development of these membranes have provided another with their own aquatic environment needed for development.

The development of amniotic membrane is a characteric of amniotic eggs. These membranes include: chorion' facilitating the exchange of gases between the embryo and the mother; amnion, protection the embryo from injuries and shock and also aiding hydration; allantois, excretion of nitrogenous waste such as urea and uric acid etc and also help in respiration.

Another characteristics is waterproof skin due to the presence of lipids.

Another is the existence of costal rib ventilation of the lungs: enables of loss of CO2 through the lungs rather than buccal pumping as foumd in anamniotes.

4 0
3 years ago
A stamen consists of _____.stigma and filament;stigma and style;ovary and sepal;anther and filament;stigma and anther;
aniked [119]

A stamen is the name for male reproductive parts of the flower which consists of an <u>Anther and Filament</u>.  

7 0
3 years ago
Read 2 more answers
C) Explain why wheat is not able to grow well in <br>nitrate poor soil.<br>​
UNO [17]

Answer:

When soil available nitrogen is low, yield and protein content will be low. As nitrogen is applied beyond these levels the wheat plant will no longer use it to

8 0
3 years ago
What is wrong with a bacterial cell if it cannot make protein
ivann1987 [24]

There are a variety of points in the transcriptional chain at which it is possible to disrupt protein synthesis in bacteria. Let’s enumerate just a few:

<span>There’s the initial point where DNA is transcribed into mRNA;<span>there’s the point where mRNA binds to the Ribosome complex;</span>there’s the point where tRNA-aminoacyl pair binds to the Ribosome according to the current codon being “read out” in the mRNA;there’s the point where the aminoacid transported by the tRNA is transferred to the growing protein chain; andthere’s the point where the protein synthesis is determined complete, and the Ribosome disengages and releases the newly-synthesized peptide chain.</span>

In each of these stages (and in some other, more subtle phases) there are possible points of disruption and there are specific disruptors; some of which are indicated in the aboveProtein synthesis inhibitor article.

Note, by the way, that the Ribosomes of Prokaryotes (bacteria) and Eukaryotes (cells with nuclei) aren’t identical, and therefore the inhibitors/disruptors that work for one type of cell may not (and usually don’t) work on the other type. That’s why we can take antibiotics targeted at bacteria with little to no fear of them interfering with our eukaryotic cells’ functions.

(This is a simplified, somewhat hand-wavy response. There is a lot more to say, mainly because biological systems are anything but simple. Nevertheless this should be enough to get you started in the general direction.)

4 0
3 years ago
The prefix mono- means “one” and the prefix poly- means “many”. How are these meanings related to the terms monomer and polymer
Dmitriy789 [7]

When a molecule is made up of one sugar unit, its called a monomer.

Eg. Glucose, galactose, fructose

When a molecule is made of more than one sugar units, its called a polymer.

Eg. Cellulose, glycogen

Polymers are usually macro molecules.

8 0
4 years ago
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