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2 years ago

Describe major trends in the evolution of life on Earth seen over geologic time supported by fossils

Biology

1 answer:

Aleks [24]2 years ago

8 0

Answer:

Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today

Explanation:

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What purpose does isopropyl alcohol serve in the process of dna extraction?

4vir4ik [10]

Answer:

The process of extracting the DNA is a very complex, time taking and tedious task. It needs lots of technical knowledge in order to extract DNA.

There are various chemicals used during the process of DNA extraction. The use of isopropyl alcohol is to precipitate the DNA.

This precipitation makes the DNA visible as it is clumped together. Then it becomes easy for the long strands of DNA to wrap around the stirrer when swirled at the interface between two layers.

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3 years ago

What name is given to cultures for identification of organisms, as well as the identification of sensitivities of the organism t

liberstina [14]

Answer:

Culture/sensitivity

Explanation:

Culture is a kind of test that detects infection-causing bacteria or fungus.

If the microorganism that causes infection grows, the result is positive; if it doesn’t, then the culture is negative.

The sensitivity test tells us what kind of medicine or antibiotic will be suitable to treat the infection.

Hence, the answer is justified.

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3 years ago

What information does the pain receptor relay to the brain about stimuli below threshold

kompoz [17]

The nociceptor does not relay any information to the brain about stimuli below the threshold. This is because stimuli below the threshold do not generate an action potential and thus the neuron is not actively signalling.

5 0

2 years ago

Describe how the water cycle moves water between the tree, the lake, and the sky in the picture below.

mixer [17]

Answer:

Explanation:

The water evaporates from the lake to form a cloud(condensation).it starts to rain(precepation)then collects back in lake.precipitation connects with living things by watering them.it also connects nonliving by processes such as evaporation, precipitation, water returns back into the atmosphere.

4 0

3 years ago

How many different GENOTYPES are present in the cross? (remember, there might be more than one of the same kind!) *

meriva

Answer: There are 9 different genotypes.

There are 4 different phenotypes.

3 offsprings out of 16 are green and rough

Explanation: The break down of the nine different genotypes are as follows:

Genotypes=>occurrence=>phenotypes

AABB ==> 1 => Green and smooth

AABb ==> 2 => Green and smooth AaBB ==> 2 => Green and smooth

AABb ==> 4 => Green and smooth

AAbb ==> 1 => Green and rough

Aabb ==> 2=> Green and rough

aaBB ==> 1 => yellow and smooth

aaBb ==> 2 => yellow and smooth

aabb ==>1 => yellow and rough

AAbb =1, Aabb =2 (a total of 3) are green and rough

8 0

3 years ago