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maks197457 [2]
3 years ago
9

The Placenta

Biology
1 answer:
emmasim [6.3K]3 years ago
6 0

Answer:

4

Explanation:

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10 A. How many years would pass if only 25% of the Potassium-40 radioactive elements are left?
kari74 [83]

Answer:

The correct answer is -

A. 2.6 × 10^9 years.

B. two half-lives.

Explanation:

According to the question, the half-life of potassium-40 is, 1.3 × 10^9 years, which means it takes 1.3 billion years to decay or disintegrate half of the initial amount of the potassium.

The half-life of K-40 = 1.3 × 10^9

The number of half-life,  => (1/2)^2 = 1/4 (25% =1/4)

n = 2

number of half life = two

the time it takes = n*half lifetime

= 2 *1.3 × 10^9

=2.6 × 10^9 years.

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3 years ago
What term did mendel used to signify his true breeding first generation?
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<span>Parental generation is the term which is mendel to signify his true breeding the first generation.The generation of different individuals genotypes that are mated, usually scientific purpose to produce hybrids.</span>
8 0
3 years ago
The coyote will become the apex predator and
xz_007 [3.2K]

Answer:

No, coyote will not become the apex predator.

Explanation:

No, coyote will not become the apex predator but greatly reduces the populations of foxes in order to reduce competition for available resources. Yes, The coyote population will decreases because t he gray wolf kills coyote to avoid competition for food resources. If another wolf is introduced to fit the same ni che, the coyote population will decrease because the wolf feeds on coyote. As the number of coyotes increase, the number of beavers will decrease because coyote feeds on beaver. If the gray wolf became extinct,  the coyote population increases in that location due to no predator.

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3 years ago
How is the brain involved with the senses and what is the relationship to the person to the way reacts to objects
Archy [21]

Answer:

The five senses collects informations from the surrounding and sends to the brain.

Explanation:

The brain through the help of the five senses helps a person to react to objects in their surroundings.

The five senses of touch sight, smell, hearing and taste all have their special sensors. These sensors are what picks messages from objects and sends to the brain. The brain then interprets the message received by the person from any of the senses.

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Reasons why there is no need for eggs of fish to be covered by a hard shell.​
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