Juan is 12 1/5 years old. How can you tell if he is still in childhood or if he is entering adolescence?
a. by how much he weighs
b. by his grade in school
c. by his birthday
d. by physical changes

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

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.