The correct answer is option (A) Variation in the strawberry plants.
When the effect of fertilizer on the growth of two strawberry plants is tested, unavoidable source of experimental error is the variation in the strawberry plants. Variation refers to the deviation or differences from the normal plant which can be due to genetic variation. It is due to change in the DNA sequence. If any one of the two plants being tested show variation, the rate of metabolism differs and changes the growth pattern of the plant. The rate of absorption of water and nutrients is effected which brings change in the growth of the plant and causes an error in the experiment and the result.
The pollution types that will result in most hypoxic waters is :
- Fossil fuel burning and
- Agricultural runoff
<h3>Hypoxic water </h3>
Hypoxic waters are waters with low concentration of oxygen and this can be caused by the presence of excessive nutrients such as nitrogen. and also can be caused by layering. These are caused by saline gradients.
The excessive nutrients present in hypoxic water support the growth algal and eutrophication.
Hence we can conclude that The pollution types that will result in most hypoxic waters is : Fossil fuel burning and Agricultural runoff
Learn more about Hypoxic waters : brainly.com/question/22727751
<em>Options related to your question is missing hence I have provided a general answer to your question</em>
Fun Fact: Rubber bands last longer when refrigerated.
Mining and Erosion are basically the two main techniques <span>that are used for these fossils to become exposed.
Mining is the extraction of minerals .
whereas
Erosion is reaction of the surface processes
hope it helps</span>
