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inessss [21]
3 years ago
7

Another students says that the earth’s magnetic poles have flipped many times in the past. How would you evaluate their statemen

t?
Question 18 options:

This is a true statement.


This false because the magnetic field is fixed and cannot change.


This is false because a compass always points at the true North Pole.


This is false because the magnetic field has only flipped once.
Biology
1 answer:
kramer3 years ago
7 0

Answer:

True

Explanation:

As a matter of geological record, the Earth's magnetic field has undergone numerous reversals of polarity. We can see this in the magnetic patterns found in volcanic rocks, especially those recovered from the ocean floors. In the last 10 million years, there have been, on average, 4 or 5 reversals per million years.

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Genetic drift occurs when a population of organisms which normally don't travel great distances, like fruit flies, floats on a t
earnstyle [38]

Answer:

True.

Explanation:

Genetic drift occurs when a species migrates into another one, therefore making a new variation of the species.

7 0
3 years ago
I need help with the question 3
LenaWriter [7]

Answer:

The correct answer is C in presence of oxygen production of acetyl CoA,TCA cycle and electron transport chain occur in a proper order.Whether in absence of oxygen lactic acid fermentation or alcoholic fermentation occurs.

Explanation:

Aerobic respiration occur in presence of oxygen which involves glycolysis,TCA cycle and electron transport chain.Aerobic respiration result in the catabolism of glucose to generate CO2,H2O and ATP.

     But in absence of oxygen or during anaerobic condition pyruvic acid is converted to either lactic acid by pyruvate dehydrogenase or to ethanol through alcoholic fermentation.

7 0
3 years ago
What is a Galaxy ? the definition of Galaxy Please
beks73 [17]
Galaxy is a collection of stars, gas, and dust bound together by gravity. The smallest galaxies may contain only a few hundred thousand stars, while the largest galaxies have thousands of billions of stars.
6 0
3 years ago
Read 2 more answers
Our understanding of DNA and gene expression has dramatically increased over the last 50 years. Describe 2 positive impacts and
lozanna [386]

Positive impacts of genetic engineering:

• New products are created such as food with higher nutrition values, drugs that are more effective and safer

• Disease prevention (“correcting” the genetic mutation, or removing disease-causing gene)

Negative impacts of genetic engineering:

• irreversible side effects, for example resistance of bacteria or introduction of viruses in human cells

• abusing like change specific traits that are not connected with diseases, create human outcomes that are ethically questionable.


3 0
3 years ago
Tratando-se sobre atividades aeróbias, segundo Cooper (1972), qual das alternativas abaixo não está correta? a) Aumento da efici
olya-2409 [2.1K]

Answer:

Diminuição do colesterol bom (HDL), aumento do colesterol mal (LDL)

Explanation.

Esto debe revertirse, debe ser una disminución del colesterol malo y un aumento del colesterol bueno.

Básicamente, el ejercicio aumenta el HDL y reduce los triglicéridos. En condiciones normales, los ejercicios aeróbicos no reducen el LDL. Sin embargo, cuando se combina con cambios en la dieta y una pérdida de peso bien controlada, el efecto combinado podría reducir el LDL.

En las condiciones estándar, el ejercicio recomendado por semana es de 150 minutos de ejercicios suaves o 75 minutos de ejercicio vigoroso por semana.

Por lo tanto, cuando se calcula por semana, esto sería un promedio de 20 minutos de ejercicio por día.

Andar en bicicleta, caminar, hacer jardinería y aeróbicos acuáticos son ejemplos prácticos de ejercicios leves o moderados que podrían aumentar el HDL. Sin embargo, el baile aeróbico, el trote y el salto de cuerda son ejemplos de ejercicios vigorosos que, cuando se combinan con la dieta y la pérdida de peso, conducen a una disminución del LDL.

This should be reversed, it should be a decrease in bad cholesterol and an increase in good cholesterol.

Basically, exercise boosts the  HDL and lower triglycerides. Under normal conditions, Aerobic exercises do not reduce LDL. However, when combined with dietary changes and well-monitored weight loss the combined effect could lower LDL.

Under the standard conditions, the recommended exercise per week is 150 minutes of mild exercises or 75 minutes of vigorous exercise per week.

Therefore, when calculated per week this would be an average of  20 minutes of exercise per day.

Biking, walking, Gardening, and water aerobic are practical examples of mild or moderate exercises that could boost HDL. However, Aerobic dancing, jogging, and rope jumping are examples of vigorous exercises which when combined with dieting and weight losses leads to a lowering of LDL.

6 0
3 years ago
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