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3 years ago

Why are top-level predators like lions and eagles so rare in a community?

1 answer:

6 0

This is because the transfer of energy from one trophic level to another is very inefficient. This is why the energy illustration of an ecosystem is more or less a pyramid structure. Only approximately 10% of biomass energy consumed by one level become biomass in the upper trophic level. The rest is lost as heat energy. This means the higher up the trophic level the fewer the organisms will be.

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Why do plant cells need a cell wall but animal cells do not

morpeh [17]

Cell walls are rigid which gives plants their shape. Animals have only cell membranes which allows animals to be flexible as animals are moving organisms. Plants, on the other hand, are sturdy and upright and are sessile organisms. Cell walls allow plants to grow upright as high as their maximum height and to be sturdy enough to survive harsh environments.

6 0

3 years ago

A sample of wood contains 12.5% of its original carbon-14 what is the estimated age of this sample

Jobisdone [24]

The age of the wood would be 17,151 year's old.

Thank you for posting your question here on brainly feel free to ask as many as needed!! GOOD LUCK! I hope I helped.

6 0

3 years ago

Do you think the biodiversity is as high in a city park as it is in a rainforest?why or why not?

geniusboy [140]

No, the biodiversity is not as high in a city park as it is in a farm or rainforest

because, in an urban city park, only the species with the most general habitat and resource requirements have generally remained in the urban park.

<h3>What is Biodiversity ?</h3>

“Biodiversity” not only refers to the number of individual species, but also the genetic variety within and between species and the diversity of ecosystems and regions.

City Parks are less likely to have biodiversity richness as compared to a farm or a rainforest.

This is because these parts are artificially created and a lot of naturally occurring flora and fauna are modified in the process. This results in dilution of biodiversity-rich place.

Learn more about Biodiversity here:

brainly.com/question/26110061

#SPJ4

8 0

2 years ago

Which macromolecule is better for you if you needed energy and were trapped on an island for 10 days without a large amount of f

cricket20 [7]

Answer:

Biology 1 End-of-Course Assessment Practice Test

For Multiple Choice Items, circle the correct response.

(1.02 MC) SC.912.N.1.1

If a company claims that its product has been proven scientifically, which of the following should

have taken place if the results are to be considered reliable?

A. The company should have held discussions with leading industry scientists.

B. Technology should have been used in both the gathering of data and data analysis.

*C. Results should have been peer reviewed and repeated producing the same findings.

D. The results of the investigation should have been published in popular magazines.

(1.02 MC) SC.912.N.1.1

Based on your knowledge of scientific investigations, which stage of scientific investigation did

the invention of the microscope significantly advance?

A. Communicating the results of experimentation

*B. Gathering the data for the investigation

C. Generating explanations of phenomena

D. Planning the investigation and experimentation

(1.02 HC) SC.912.N.1.1

A student is conducting an investigation to determine the effect of temperature on the

metabolism of yeast (Saccharomyces cerevisiae). Yeast and sugar are added to water, the gas

produced is captured, and its volume is recorded. Which variables should be held constant

during this investigation?

A. Mass of sugar and water temperature

*B. Mass of yeast and mass of sugar

C. Volume of gas and water temperature

D. Volume of gas and mass of yeast

(1.02 MC) SC.912. L.14.1

Scientific law and a scientific theory are similar in that both

A. are based on what we expect to happen based on natural history

B. describe the events that can be observed in nature

C. explain why events and conditions occur as they do in the natural world

*D. represent a large amount of scientific investigation and evidence

6 0

3 years ago

A. Determine the surface area, volume, and surface area to volume ratio for the following three blocks. Then, state which one yo

insens350 [35]

Explanation:

In a cell, the rate of diffusion is higher when the surface area to volume ratio is higher.

- given that a cube or block has 6 sides...

Volume ⇒ 1.5 cm x 1.5 cm x 1.5 cm= 3.375 $cm^{3}$

Surface area ⇒ (1.5 cm x 1.5 cm x 1.5 cm) x 6=13.5 $cm^{2}$

Surface area :Volume ⇒ $\frac{13.5}{3.75}$ = 1:4

Volume ⇒.5 cm x .5 cm x 6 cm= 1.50 $cm^{3}$

Surface area ⇒(2 (.5 cm x .5 cm)) + (4(.5 cm x 6 cm))= 0.5+12 = 12.5 $cm^{2}$

Surface area :Volume ⇒ $\frac{12.5}{1.5}$ = 25: 3

Volume ⇒3 cm x 2 cm x 2 cm= 12 $cm^{3}$

Surface area ⇒(2 (3 cm x 3 cm ))+(4(3 cm x 2 cm))=42 $cm^{2}$

Surface area :Volume ⇒ $\frac{42}{12}$ = 7:2

<em>The highest ratio is said to be the most efficient; with a higher surface area, more substances can pass across the surface of the cell at a time. </em>

<em />

Further Explanation:

Cells require all substances to cross the cell membrane. These, like agar, which contains small pores, is semi permeable -only allowing some molecules to pass cross the membrane or surface. The cubes contain a pH indicator that reacts with the solute, vinegar. Cell membranes contain lipids which form a barrier; polarity or arrangement can give these non-polar macromolecules hydrophilic and hydrophobic properties.

Via diffusion, small water molecules can move across the phospholipid bilayer acts as a semi-permeable membrane into the extracross the phospholipid bilayer acts as a semi-permeable membrane into the extracellular fluid or the cytoplasm which are both hydrophilic and contain large concentrations of polar water molecules or other water-soluble compounds. The hydrophilic heads of the bilayer are attracted to water while their water-repellent hydrophobic tails face towards each other- allowing molecules of water and water soluble molecules, to diffuse across the membrane along the concentration gradient

acellular fluid or the cytoplasm which are both hydrophilic and contain large concentrations of polar water molecules or other water-soluble compounds. The hydrophilic heads of the bilayer are attracted to water while their water-repellent hydrophobic tails face towards each other- allowing molecules of water and water soluble molecules, to diffuse across the membrane along the concentration gradient

Thus in smaller cubes the rate of diffusion is higher as the surface area to volume ratio is higher; the vinegar diffuses all the way to the center, as indicated by the color change in the cube.

However as cells increase in size, their surface area:volume ratios decrease rapidly; larger cells, like the larger agar cubes, have a harder time moving molecules across the membrane, so the color change cannot be seen in the middle, as there was less of a permeable surface for the vinegar to diffuse across. to combat this, eukaryotic cells have specialized mechanisms to transport molecules along with membrane-bound organelles like the endoplasmic reticulum that provide a higher surface area for absorption and enable more efficient transportation.