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r-ruslan [8.4K]
3 years ago
5

Potassium-40 has a half-life of 1.3 billion years. If a rock was

Biology
2 answers:
Maksim231197 [3]3 years ago
5 0

Answer: The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.

pogonyaev3 years ago
3 0
The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
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Before a captive breeding program and subsequent reintroduction of the black-footed ferret it is believed that their total popul
irga5000 [103]

Answer:

a) 99.93%

b) 99.98%

Explanation:

Given that:

Total population size was only around 18 individuals ( for  black-footed ferret)

If the annual survival rate in the wild was 0.4%.

a)

What is the probability that all 18 would have died in a single year?

To find that; we multiply the annual survival rate in the wild with the total population; which is:

(0.4%×18) = 0.072%

Then; we subtract it from a total of 100% in order to determine the probability that all 18 would have died in a single year.

= (100.00% - 0.072%)

= 99.93%

b)

What is the probability that all 18 would have died in a single year if canine distemper was present?

Given that;

Because of the presence of canine distemper disease, the annual mortality rate might have been as high as 0.89.

To determine the probability; we have:

1 - Annual mortality rate = annual survival rate

1 - 0.89 = 0.11 %

Therefore, 0.11% of 18 individuals = (0.0011 × 18)

= 0.0198%

Probability that all 18 would have died in a single year if canine distemper was present = 100 - probability of annual survival rate

= (100 - 0.0198)%

= 99.98%

7 0
3 years ago
Organisms that gain energy by eating food are called:
kogti [31]

Answer:

Heterotrophs or consumers

Explanation:

This are organisms that cannot produce their own food. They rely on autotrophs ( plants or producers ) for food. Most of the times these are normally animals.

HOPE THIS HELPED

8 0
3 years ago
Which state of matter is the most dense?
Lubov Fominskaja [6]
Solid. it's all stuck and linked together, while liquids are flowing along and gases fly around wherever they please. Hope this helps
4 0
4 years ago
What are the types of wastewater?
eimsori [14]

The types are Blackwater, Graywater and Yellow water.

You can find two types of wastewater: household sewage and wastewater

7 0
3 years ago
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What are two properties of a good marker and why are good markers important?
a_sh-v [17]

Answer:

1. the color shown is the same as the color that it produces 2. the ink doesn't run out frequently

Explanation:

A good marker is determined by a fair price for a good quality .

8 0
3 years ago
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