In guinea pigs, brown hair is dominant and grey hair is recessive. A guinea pig breeder has a brown Guinea pig with an unknown genotype. He bred the unknown guinea pig with grey haired one and had a litter with 8 grey and 6 brown offspring. What is the genotype of the unknown brown guinea pig parent?

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.