Science aims to explain and understand it <span>aims to produce more and more accurate natural explanations of how the natural world works, what its components are, and how the world got to be the way it is now</span>
My Answer: <span>When only a small amount of DNA is available, such as at a crime scene.
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Answer:
presence or absence of a protective covering over the ovule
Explanation:
In angiosperms, seeds develop from ovules and are enclosed in the ovary. So, their is the presence of protective covering making the seeds enclosed.
On the other hand, gymnosperms have seeds that are borne on cones, so they are naked due to the absence of any protective covering over the ovule.
<span>Genes are sections of DNA that program the amino acid sequences of proteins
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A chemical change must have occurred in investigation B step 2 because a change in color occurred.
<h3>What is a chemical change?</h3>
A chemical change is said to occur when a new substance has been formed. The markers of the occurrence of a chemical change are signs such as;
- Evolution of a gas
- Appearance of a solid
- Change of color
- Change of temperature
Now a physical change does not involve the formation of a new substance. Physical change would always involve the change of a substance from one form to another such as the melting of ice.
As such, in looking our for the steps in which a chemical change occurred we must look out for the properties of a chemical change as mentioned above.
Now, a chemical change must have occurred in investigation B step 2 because a change in color occurred.
Learn more about chemical change:brainly.com/question/23693316
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Missing parts;
Investigations were carried out in a science lab to explore the topic of chemical and physical changes. Investigation A Step 1. Add 5 tsp. salt to 100 ml warm water and stir until most or all of the salt is no longer visible. Step 2. Heat the salt solution on a burner until only a white solid remains. Investigation B Step 1. Mix 10 tsp. white sugar into 100 ml water and stir until most or all of the sugar is no longer visible. Step 2. Heat the sugar solution on a burner until the solution thickens and turns brown. In which step(s) did a chemical change most likely occur?