Answer:
I think its C because it releases carbon
The answers are:
1. The dependent variable is distance as it varies with the reading time interval of 30 minutes.
2. The independent variable is the elapsed time with a fixed interval of 30 minutes.
3. Natalie had run approximately 8 Km in 40 minutes, marked in the graph. So she must have run, 15-8=7 Km after 40 minutes.
4. To calculate: Average speed, Given: Total distance = 15 Km, Total time elapsed = 150 minutes.
Time in hours will be 

Answer: C
Explanation: The mutations cause new genes, and the changes might have advantages over diseases leading to evolution.
Answer: Expected heterozygous genotype = 2×46 = 92
Explanation:
According to the hypothesis of segregation of paired genes in heterozygous F1 generation crosses produces 1:2:1 genotype ratio. This means that all these three possible genotypes should be produced in the F2 generation meaning that we have 1(Dominant homozygous) :2 (Dominant heterozygous): 1 (Recessive Homozygous).
Phenotypic ratio shared (dominant: recessive) = 154 and 46
If recessive homozygous phenotype = recessive homozygous genotype = 46
The expected dominant heterozygous genotype= 2 × (recessive homozygous genotype)
= 2 × 46 = 92