Hemophilia is an x-linked recessive disorder. A punnett square is shown. The columns are labeled upper x h and upper y. The rows are labeled x upper h and x h. What is the probability of the offspring having hemophilia for the cross that is shown in the punnett square? 0 percent 25 percent 50 percent 75 percent.

What is a good tip to follow in the day you take the aspire test or psat

In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.

What are the three stages of volcanic activity? a. active, magma, lava c. extinct, eruption, explosive b. eruption, quiet, explosive d. active, dormant, extinct