All categories

2 years ago

What evidence indicates that the Earth is 4.6 billion years old?

Biology

1 answer:

beks73 [17]2 years ago

8 0

Answer:

In uranium-lead dating, for instance, the radioactive decay of uranium into lead proceeds at a reliable rate. Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old.

And that's how after rounding we know that earth is 4.5 years old.

You might be interested in

In diffusion and osmosis what happens to the concentration of water inside each cell

avanturin [10]

diffusion is the movement of molecules or stuff through the cell membrane

osmosis is the movement of water

water move from high contration to lower concentration

the there is salt outside of the cells the water will move out of the cell membrane and if there is salt inside the cells the water will move into the cell

6 0

3 years ago

Drag the tiles to the correct boxes to complete the pairs.

Ulleksa [173]

bottleneck effect --- > A disease wipes out almost 90% of a population of birds, but the species adapts, and after 5 years its numbers increase dramatically.

gene flow ---> A population of rats travels on a cargo ship and mate with rats in a new region.

founder effect ---> Biologists introduce a small population of lizards on an island as part of a conservation effort.

mutation ---> A change in a DNA sequence causes a lizard to develop a darker skin color, which helps it hide from predators.

7 0

3 years ago

Read 2 more answers

Viewing the shape of a bacterial or archaeal cell using a microscope gives a great deal of information about the metabolism and

ivann1987 [24]

The information as stated is false.

<h3>What is a microscope?</h3>

A microscope is a device that could be used to view the interior of a cell. It is a device that uses light to show the interior of the cell. The magnification of the microscope is what determines how much information that you could get from it.

The first compound microscope was discovered by Robert Hooke and was used extensively in the study of cells and this is how the study of microorganisms became more elaborate.

Thus, it is false to say that viewing the shape of a bacterial or archaeal cell using a microscope gives a great deal of information about the metabolism and lifestyle of the organism.

Learn more about microscope:brainly.com/question/18661784?

#SPJ1

8 0

1 year ago

The climate in the tropical zone is characterized by___

tigry1 [53]

The climate of the tropical zone characterized by a very wet season alternating with a very dry season is wet/ dry topical climate.

8 0

3 years ago

Read 2 more answers

Neville has low blood pressure and his pituitary started producing a homorone to maintain water balance his blood pressure event

ivanzaharov [21]

Answer: The options are missing in the question,the options are;

A) Positive feedback will stop the release of this hormone.

B) Positive feedback will speed up the release of this hormone.

C) Negative feedback will speed up the release of this hormone.

D) Negative feedback will stop the release of this hormone.

The correct answer to the question is option D

NEGATIVE FEEDBACK WILL STOP THE RELEASE OF THIS HORMONE.

Explanation: The hormone the will be produced is known as Antidiuretic hormone (ADH).it is otherwise known as VASOPRESSIN.It is secreted by the posterior lobe of the pituitary gland.

The main effect of Antidiuretic hormone is to reduce urine output,(diuresis is the production of large amount of urine). Antidiuretic hormone acts in the distal convulated tubules and the collecting ducts of the nephrons of the kidneys,it increases their permeability to water and more of the glomerular filtrate is reabsorbed. Antidiuretic hormone secretion is determined by the osmotic pressure of the blood circulating to the osmoreceptors in the hypothalamus.

As osmotic pressure rises,for example as a result of dehydration, secretion of Antidiuretic hormone increases. With this,there is Increased reabsorption of water reducing the amount of urine produced.This implies that more water is retained in the body making the rise in the osmotic pressure of the blood to be low,for example,after a large fluid intake, secretion of Antidiuretic hormone is reduced,less water is reabsorbed and more urine is produced.

At high concentrations,for example after severe blood loss, antidiuretic hormone causes smooth muscle contraction, especially vasoconstriction in small arteries.this has a pressor effect,raising systemic blood pressure.

5 0

3 years ago