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galben [10]
3 years ago
12

A scientist is studying a radioactive element that has a half-life of 63 years. Choose the correct answers from the drop-down me

nus to complete each statement about the element.
It will take
blank
years for half of the sample to decay.

In 189 years, blank
of the sample will be left.

Scientists can figure out how old a sample is by multiplying the blank
by the length of the half-life.
Biology
2 answers:
tatyana61 [14]3 years ago
7 0

Answer:

It will take 63 years

In 189 years, one-eight of the sample will be left

By multiplying the number of half-life cycles

Explanation:

LekaFEV [45]3 years ago
3 0

Answer:

It will take 63 years

In 189 years, one-eight of the sample will be left

By multiplying the number of half-life cycles

Explanation:

I just completed this assignment.

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HELP!
lidiya [134]

Answer:

A. Compounds contain fixed ratios of different elements.

Explanation:

Water always has this 2:1 ratio of hydrogen to oxygen. Like water, all compounds consist of a fixed ratio of elements. It doesn't matter how much or how little of a compound there is. It always has the same composition.

3 0
2 years ago
Genetic variation helps populations adapt to a changing
timama [110]

Answer:

Please find the explanation below

Explanation:

Sexual reproduction is the kind of reproduction that requires two organisms (male and female) to form an offspring. The male organism produces gametes called SPERM while the female organism produces gametes called EGG. These two gametes come together in a process called FERTILIZATION to produce a zygote, which develops into an offspring.

In sexual reproduction, gametes are produced by organisms involved via a process called MEIOSIS. Meiosis, however, reduces the chromosome number of the gametes by half. However, one process unique to only meiosis and sexual reproduction is called CROSSING OVER.

Crossing over is the process whereby chromosome segments is exchanged between non-sister chromatids of homologous chromosome. This process causes a recombination of chromosomes (alleles) in such a way that the gametes will be genetically different from the parent organisms (genetic variation). According to this question, sexual reproduction leads to more genetic variation than asexual reproduction due to the process of CROSSING OVER that occurs in sexual reproduction.

4 0
3 years ago
Which characteristic contributes to the quick nutrient cycling in tropical rain forests? O A. Heat and high humidity O B. Deep,
aliya0001 [1]

Answer:

A. Heat and Humidity

Explanation:

The hot, damp conditions on the forest floor allow for the rapid decomposition of dead plant material.

5 0
2 years ago
A gas has no definite:<br> a shape<br> b volume<br> c<br> weight<br> d both A and B
mr Goodwill [35]

Answer:

a gas has no definite Shape and Volume

Explanation:

hope this helps! have an amazing day lovely!

6 0
2 years ago
18) The Susquehanna River, which runs through the states of New York, Pennsylvania, and Maryland,
kirill [66]

The biodiversity will decrease due to an increase in pollution is the effect will have on the biodiversity on the river ecosystem.

Option A

<u>Explanation:</u>

Biodiversity is the actual collection of total amounts of flora and fauna present in a particular ecosystem. The river ecosystem consists of the aquatic plants, the aquatic animals like fishes,etc and even the surrounding land plants and animals, who utilize the river water for their living.

The inclusion of the polluted sewage of the surrounding area into the river directly mixes several chemicals to the water, which are potentially harmful for all the animals living there. This leads to destruction of the flora and fauna of both water and lands surrounding them. This hampers the biodiversity of the water as well as surrounding land.  

4 0
3 years ago
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