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joja [24]
2 years ago
7

Which one of the following populations begins the flow of energy through the food web?

Biology
2 answers:
Natali5045456 [20]2 years ago
8 0

Answer: Shrubs

It's at the bottom of the food web.

vladimir1956 [14]2 years ago
3 0
If the web happened to look like this one I attached then the anwser would be shrubs. If you take a look at the arrows the shrubs energy is moving to rats, insects and lizards which in turn feeds the coyotes. The starting point is shrubs and in general most food webs start with plants.

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Describe the process of chromatographic separation. You need to include both the equilibrium model to predict retention times an
Kay [80]

Answer:Chromatography is actually a way of separating out a mixture of chemicals, which are in liquid or gas form, by letting them flow slowly past another substance, which is either a solid or a liquid. It consist of a stationary phase and a mobile phase.

Explanation: All chromatographic systems rely on the fact that a substance placed in contact with two unmixable phases, one movable phase and one stationary phase, will equilibrate between them. A selectivity (or separation) factor (α) is used to 'chemically' distinguish between sample components. It is usually measured as a ratio of the retention (capacity) factors (k) of the two peaks in question and can be visualized as the distance between the apices of the two peaks. reproducible fraction will partition into each phase, depending on the relative affinity of the substance for each phase. A substance which has affinity for the moving or mobile phase will be moved rapidly through the system. A material which has a stronger affinity for the stationary phase, on the other hand, will spend more time immobilized in that phase, and will take a longer time to pass through the system. Therefore, it will be separated from the first substance. By definition, chromatography is a separation technique in which a sample is equilibrated between a mobile and a stationary phase. A theoritical plate or tray is used to produces the best possible difference between the liquid and vapour phases in equilibrium with it

Chromatographic separations are best done with a small amount of analyte (substance to be separated during analysis), which keeps either phase from becoming saturated with analyte, so that the concentrations in the two phases are directly proportional. Overloading the column with sample causes one of the phases to become saturated, leading to a loss of column efficiency, and poorly shaped peak profiles.

The retention volume in chromatographic separation (Vr) is the volume of the mobile phase required to carry the solute through the column to elution, is related to the column flow (Fc) and the retention time (tr). Likewise, the volume of the mobile phase(Vm), is related to the flow and the time the void volume takes to pass through the column.

Band broadening using the kinetic model is a phenomenon that reduces the efficiency of the separation being carried out, leading to poor resolution and chromatographic performance. This is problematical in terms of both the quality of the separation obtained and the accuracy with which sample components can be quantified.The wider band results in a dilution effect that produces a decrease in peak height accompanied by a loss in sensitivity and resolution. The eddy dispersion, accounts for the source of band broadening related to any flow unevenness in the column.

4 0
3 years ago
What do you understand by fumigation?
Triss [41]
Fumigation is a method of pest control that completely fills an area with gaseous pesticides ,or fumigants, to suffocate or poison the pests within
6 0
3 years ago
Define 'ecosystem'. <br>with explanation<br>★★★★★​
TiliK225 [7]
Ecosystem is a community or group of living organisms that live in and interact with each other in a specific environment.

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows.
4 0
3 years ago
Biologist use what to create a cladogeam and why
Fynjy0 [20]

Answer:

DNA/ Traits

Explanation:

they trace species origins back and find common point and every time they do, they connect them on the line, creating something that looks like "branches" google "cladogram"

8 0
3 years ago
Women above the age of 50 (generally)unable to give birth to child.Explain the reason for the same ​
stich3 [128]

Explanation:

Their ability of producing the woman's sex cell is destroyed, now they can not produce eggs and their menstrual cycle is also stopped known as menopause.

8 0
3 years ago
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