BIOLOGY HIGH SCHOOL

A scientist begins working by trying to explain a natural occurrence that is

Answers

Answer 1
Answer:

Here is the full statement: A scientist begin working by trying to explain a natural occurrence that is OBSERVABLE.

Scientific method refers to the techniques that scientists used to carry out scientific investigations and it is made up of series of steps. The first step is observation. A scientist normally begin the process of scientific investigation by observing a phenomenon that occur naturally. The observation will lead to questions, which need to be answered and which eventually lead to conduction of experiments.

Answer 2
Answer:

Answer: Observable

Explanation: I got it correct on Pearson


Related Questions

MIDDLE SCHOOL

List the parts of the respiratory system, which air passes through

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Answer:

The respiratory system starts at the nose and mouth and continues through the airways and the lungs. Air enters the respiratory system through the nose and mouth and passes down the throat (pharynx) and through the voice box, or larynx.

Explanation:

Answer:

The respiratory system starts at the nose and mouth and continues through the airways and the lungs. Air enters the respiratory system through the nose and mouth and passes down the throat (pharynx) and through the voice box, or larynx

MIDDLE SCHOOL

Which of the following is a density-independent limiting factor? A. Earthquake B. Disease C. Parasitism D. Emigration

Answers

The correct answer is earthquake

density-independent factor Any factor limiting the size of a population whose effect is not dependent on the number of individuals in the population. An example of such a factor is an earthquake, which will kill all members of the population regardless of whether the population is small or large.

A. Earthquake is the answer



HIGH SCHOOL

When true-breeding mice with brown fur and short tails (BBtt) were crossed to truebreeding mice with white fur and long tails (bbTT), all F1 offspring had brown fur and long tails. The F1 offspring were crossed to mice with white fur and short tails. What are the possible phenotypes of the F2 offspring?

Answers

Answer:

Brown fur, long tail (1)

Brown fur, short tail (1)

White fur, long tail (1)

White fur, short tail (1)

Explanation:

This is a cross involving two genes, one coding for fur colour and the other for tail length in mice. B and b are alleles for brown and white fur respectively while T and t are alleles for long and short tails respectively. According to the first cross in the question where a brown short-tailed mice (BBtt) was crossed with a white long-tailed mouse (bbTT) to produce a brown long offspring (BbTt), it shows that the brown fur allele (B) and Long tail allele are dominant over the white fur allele and short tail allele respectively. Since, their expression is masked.

Hence the F1 offsprings genotype is BbTt. When BbTt are crossed with a white fur and short-tailed mouse (bbtt), each parent produces the following gamete:

BbTt: BT, Bt, bT and bt

bbtt: bt, bt, bt, bt

Combining these gametes in a punnet square will produce 16 possible offsprings with only four different genotypes in the ratio 1:1:1:1.

The four genotypes with their Phenotypes are:

BbTt: brown fur, long tail (4)

Bbtt: brown fur, short tail (4)

bbTt: white fur, long tail (4)

bbtt: white fur, short tail (4)

Answer:

F2 phenotypes: brown fur, short tails; brown fur, long tails; white fur, short tails; and white fur, long tails.

MIDDLE SCHOOL

Why nitrogen must cycle through an ecosystem

Answers

Nitrogen must be cycled through an ecosystem so that the nitrogen is available for organisms to make proteins. ... Bacteria in the soil combine nitrogen with hydrogen to form ammonia. 

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