Explanation: Since when a child is born it has DNA from both. As an example, the mom has brown hair, father has blonde hair, the child would take the DNA for the type of hair they get, either blonde or brown. So since its blood, the fathers is A, and the boy's is B, therefore it didn't take any of their DNA's so nope, he isn't the father.
Answer: The literal reason would be because our ancestors did. The ancestors of all modern mammals had five digits on each limb up to 360 million years ago.
<span>1. temperature 2.water purification 3. succession 4. alien species 5. conduct a survey of a species population in an ecosystem 6. adopt ecological conservation practices</span>
I believe it is the first one "If increasing the temperature of a solvent increases the solubility of solutes in it, then increasing the temperature of water will allow more sugar to dissolve in it."
