<span>The discovery of thornless plants was made around the turn of the 20th century. To name one such thornless plant, particularly, the Blackberry plant, the deviation from the thorned blackberry canes were discovered in the United States. Since then, several different thornless blackberry varieties have been cultivated for fruit gardens.</span>
It is The shoot and the root systems
Answer:
Explanation:
Student A because it requires a hypothesis
Uranium- lead which is the oldest & one of the most <span>refined of the </span>radiometric dating<span> schemes</span>