The ozone layer is the answer!
Answer:
1. Nucleus
2. Nuclear DNA
3. Chromosomes. They contain the DNA.
4. This is DNA. DNA contains the instructions needed for an organism to develop, survive and reproduce.
The Earth was first considered habitable when we discovered that it was Microbial organisms that started the process. I would go with D.
Answer:
50%
Explanation:
This question involves a single gene with two alleles W and w in puppies. According to the question, the genotype of the parent organisms are Ww. In a cross between the two parents i.e. Ww × Ww, the following gametes will be produced by each parent: W and w.
Using these gametes in a punnet square (see attached image), the following genotype of offsprings will be produced: WW, Ww, Ww, ww. Hence, based on this question, the percentage of puppies that would have the same genotype as the parents, Ww are 1/2 × 100% = 50%.