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Deffense
2 months ago
13

Which statement best describes a keystone species?

Biology
2 answers:
Tresset [2.2K]2 months ago
8 0

The right answer is option d as its absence would impact many organisms in the ecosystem.

Keystone species are crucial for the ecosystem's health. If such a species were to disappear from an ecosystem, it would disrupt the ecosystem's functioning, leading to significant consequences. Therefore, keystone species are vital for the ecosystem's survival.

-BARSIC- [2.5K]2 months ago
4 0

The correct response is D. A keystone species is defined as one that other species within an ecosystem heavily rely upon, to the extent that its removal would cause a significant alteration in that ecosystem.

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A pregnant female is rh negative and at 28 weeks gestation. the child's father is rh positive. the mother is given an injection
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Anti-D immunoglobulins, or anti-D (RH) immunoglobulins, are a type of immunoglobulin (IgG). These proteins play a vital role in our immune system. Anti-D immunoglobulins are derived from human blood sourced from volunteer donors. They are administered to a pregnant woman in instances of Rh incompatibility between her and her child. The relevant CPT codes are: 90384 and 90385 for intramuscular use, and 90386 for intravenous use. The ICD-10-CM code is Z29.13.
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1 month ago
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If a more concentrated initial solution of sodium bicarbonate was used in beaker C, would it require more or less bicarbonate to
lana [2441]

Response:

It would need a lower amount of bicarbonate to neutralize the acid.

Explanation:

Sodium bicarbonate (NaHCO3) is a partially soluble sodium salt that breaks down in water to create a weakly basic buffer solution. It separates in water releasing bicarbonate ions (HCO−), sodium ions (Na+), and H+.

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

Buffer solutions are maintained in equilibrium. In a solution with a strong acid, the conjugate base reacts, while other carbonate ions release to form carbonic acid, driving the solution back toward balance.

HA ⇄ H+ + A-

Due to its buffering capability, which is how effectively it stabilizes the equilibrium, less bicarbonate will be required later on to neutralize the acid.

6 0
1 month ago
The Lotka-Volterra model produces consistently identical cycles because it is deterministic. The lynx and hare simulation on the
-BARSIC- [2551]

Answer:

B. Random and unforeseen occurrences take place in the real world, causing the Lotka-Volterra parameters to change with time.

Explanation:

Lotka-Volterra equations are mathematical representations that illustrate the interactions between predator and prey species, based on these assumptions:

  • The ecosystem is closed, with no migration events.
  • All individuals are considered reproductively similar.
  • In the absence of predators, prey populations exhibit exponential growth, thriving in optimal conditions.
  • If predators are absent, their population declines exponentially, limited by prey availability in an ideal environment.
  • The rate of predation correlates with the frequency of encounters, which is density-dependent.
  • Predators influence prey populations, leading to a decrease proportional to both predator and prey numbers.
  • Conversely, prey population also affects predator numbers based on encounter ratios.

In these equations, variable D denotes predator count, while P represents prey count.

The constants remain unchanged:

  • r1: prey growth rate.
  • a1: predator hunting efficiency.
  • r2: predator growth rate.
  • a2: predator success rate in feeding and hunting.

In nature, various factors influence interactions, including density-dependent and density-independent factors. Additionally, real-world situations are affected by stochastic elements. Stochasticity represents the variations in the system caused by elements that impact population growth. This variability may correlate with prosperous and challenging years.

During a real scenario, the full adherence to the assumptions is unlikely. The previously mentioned constants can fluctuate, leading to changing interactions between predator and prey populations. Different variations lead to different experiences for both species.

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3 months ago
Por qué las plantas de regiones lluviosas tienen en sus hojas abundantes estomas?
garik1379 [2080]

Cuando el agua es abundante (no limita), las plantas tienen la capacidad de poseer más estomas, lo que aumenta el acceso al agua (y a los iones de hidrógeno necesarios) y proporciona un mejor soporte a los tejidos herbáceos.

Espero que esta respuesta sea correcta :)

8 0
3 months ago
4. What is the main reason that attitudes are more often revealed in spoken rather than written language?
Rainbow [2354]
Attitudes are typically more apparent in spoken language than in written text because writing allows us to easily hide our true feelings. Therefore, the correct answer is D. 
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1 month ago
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