What is it called when white blood cells follow a chemical trail

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.

Sickle cell amelia is a condition condition where the red blood cells are deformed which is affected by sickle cell amenia

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?