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3 years ago

Explain two difficulties an ecologist might have in counting a population of migratory birds

1 answer:

5 0

1. She might count some of the birds multiple times.

2. There's way too many birds and species to possibly count ALL of them perfectly

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Cells can be described as having a cytoskeleton of internal structures that contribute to the shape, organization and movement o

Assoli18 [71]

Answer: C. Microfilaments

Explanation: Microfilaments, also called actin filaments, are protein filaments in the cytoplasm of eukaryotic cells that form part of the cytoskeleton. They are primarily composed of polymers of actin, but are modified by and interact with numerous other proteins in the cell. Microfilaments, or actin filaments, are the thinnest filaments of the cytoskeleton and are found in the cytoplasm of eukaryotic cells. The polymers of these linear filaments are flexible but still strong, resisting crushing and buckling while providing support to the cell.

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3 years ago

The first P-wave of an earthquake took 11 minutes to travel to a seismic station from the epicenter of the earthquake. What is t

iris [78.8K]

Answer:

$\large \boxed{\text{5280 km; 25.5 min }}$

Explanation:

1. Distance from epicentre

The average speed of P-waves is about 8 km/s.

(a) Convert minutes to seconds

$\text{Time} = \text{11 min} \times \dfrac{\text{60 s}}{\text{1 min}} = \text{660 s}$

(b) Calculate the distance

$\text{Distance} = \text{ speed} \times \text{time} = \dfrac{\text{8 km}}{\text{1 s}} \times \text{660 s} = \textbf{5280 km}\\\\\text{The seismic station's distance to the epicentre is $\large \boxed{\textbf{5280 km}}$}$

2. Time for S-wave

The average speed for an S-wave is about 3.45 km/s.

$\begin{array}{rcl}\text{Distance} & = & \text{speed} \times \text{time}\\\text{5280 km} & = & \dfrac{\text{3.45 km}}{\text{1 s}} \times \text{time}\\\\5280 \times \text{1 s} & = & 3.45 \times \text{time}\\\text{Time} & = & \dfrac{\text{5280 s}}{3.45}\\\\ & = & \text{1530 s}\\& = & \textbf{25.5 min}\\\end{array}\\\text{It took the first S-wave $\large \boxed{\textbf{25.5 min}}$ to arrive.}$

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3 years ago

How has modern humans<br> ecological footprint caused a Tragedy of the Commons?

Anastasy [175]

Answer and Explanation:

The ecological footprint is an indicator of sustainability at an international level that integrates all the human impacts over the environment, considering the necessary resources and the generated residues to maintain the modern consumption model. It refers to the productive ecological surface needed to produce resources to consume by one person and to absorb the residues that are produced.

By constant contamination and indiscriminately use of natural resources the impact generated by human in the earth is unmeasurable.

The tragedy of the commons refers to how some people, acting by their own needs or interests, may exceed the use of natural resources, affecting their population and, therefore, other users. These individuals over explode resources thinking only in the present, but not in the future.

The ecological footprint as an indicator makes visible the unsustainable lifestyle of human beings, especially those of the first world. If this lifestyle would project to the rest of the world equally, natural resources would completely disappear. More developed countries are over contaminating and over exploding natural resources, affecting other countries of the third world, and even themselves.

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3 years ago

State the monosaccharaides that form these isaccharides

Minchanka [31]

Answer:

Explanation:

Well the question was a little unclear, but for disaccharides:

(alpha) Glucose + (alpha) Glucose = Maltose

(alpha) Glucose + Fructose = Sucrose

(alpha) Glucose + Galactose = Lactose

4 0

4 years ago

Which type of blood cell is the first to arrive at a bacterial infection?

alexdok [17]

Answer: Neutrophil is the first to arrive

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3 years ago