The corrrect option is D.
Since the scientist was trying to determine if substance A affect the rate of reaction of X and Y, the best thing to do is to make substance X and Y to react together first, he should then measure the time taken for the reaction to take place. Next, he should make X and Y to react together again, but this time in the presence of A. The time taken for the reaction to occur should be measures. The scientist can now compared the two time measurements and decide if there are difference between them or not.
The purpose of selective breeding<span> is to develop livestock whose desirable traits have strong heritable components and can therefore be propagated.</span>
An adaptation refers to both the current state of being adapted and to the dynamic evolutionary process that leads to the adaptation
Pollution or Carbon Dioxide
Answer:
nondurable!
Explanation:
The material that after sometime become useless .
These include:-
- vegetables
- clothes
- paper products
- food products
- bulbs
Non-durable material have lifespan of less than 3 years.