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Vesnalui [34]
3 years ago
10

The noble gases in group 18 were some of the last natural elements to be discovered. Why do you think this is so?

Biology
1 answer:
zmey [24]3 years ago
4 0

Answer:

because they were extremely un-reactive. Being inert, they were difficult to isolate via chemical reactions, thus difficult to distinguish as separate elements

Explanation:

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Can someone please help me
Mariana [72]
The answer is b, chloroplast.
4 0
2 years ago
In Africa, dragon color is co-dominant. The colors blue and yellow are co-dominant.
pshichka [43]

1 Blue and yellow: 1 yellow

Let us assign the allele for Blue dragon color as B and that of Yellow dragon color as Y and create the punnet square below;

The phenotypic ratio will, therefore, be;

1 Yellow/Blue : 1 Yellow

3 0
3 years ago
The process by which an individual seeks out environments that correspond to their genotypic characteristics is described as the
Lilit [14]

Answer:

Active genotype - environmental effects

Explanation:

There are primarily three types of co-relation between genotype and environment which are as follows –  

a) Passive genotype –environment effect – This depicts the relationship between the genetic characteristics acquired by a child from his/her parents and the environment in which he/she is raised.  

b) Reactive genotype –environment effect – This represents a relationship between genetically acquired behaviour from parents and the reaction corresponding to such behaviour.  

c) Active genotype –environment effect – This represents a relationship between genetic tendency of an individual and the environment condition selected by an individual .

5 0
3 years ago
Scientists have studied the return of plant life on Mount St. Helens ever since the volcano erupted in
zzz [600]

Answer:

C.

The ecosystem there will definitely go through ecological succession by which the structure of the flora there will evolve over time into forests.

7 0
2 years ago
A. 100 per 100,000<br> B. 500 per 100,000<br> C. 1000 per 100,000<br> D. 5000 per 100,000
Dafna1 [17]

This Question is not complete

Complete Question

There were 100 new cases of syphilis last year in a given population of 100,000 people. At that time, 500 people in this population already had syphilis. The incidence of syphilis in this population is __________.

a. 100 per 100,000

b. 500 per 100,000

c. 1000 per 100,000

d. 5000 per 100,000

Answer:

a. 100 per 100,000

Explanation:

Incidence rate of a population can be defined as the rate at which an disease occurs in a population.

The incidence of a population is calculated as

The number of new cases ÷ The population of the people

From the above question,

The number of new cases = 100

The population of the people = 100,000

The incidence = 100 ÷ 100,000

The incidence of syphilis in the population is 100 per 100,000

7 0
3 years ago
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