Answer:
3.Fitness is related to whether an organism's adaptations result in more offspring
The answer is sediments because sediments break down and are every where on earth also break down due to weathering
First one, disease causing microorganisms
Homozygous.
You can tell in future that if both letters are either lowercase or upper case (e.g. TT or tt) the answer is always HOMOzygous. If the letters are different cases (e.g. Tt or tT) the answer is always HETROzygous. This is because 'homo' means 'same' and 'hetero' means 'different'.