How do fraternal twins form?

A - two eggs are fertilized by one sperm

B - two sperm fertilize an egg

C - A fertilized egg splits in two

D - two eggs are fertilized by two sperm

Why is it a problem that we keep cutting down our forest?

Which structure connects the lateral ventricles to the third ventricle?

Which biological factors may increase risk for aggressive or illegal behavior? (Select all that apply.) skull shape the personality trait of high conscientiousness body shape exposure to lead or other toxins before birth brain injuries

The collective term for all of the chemical reactions in a living organism is

Are organisms within rain forest food chains interchangeable?

Under what conditions will the body use significant amounts of protein for energy during exercise? a. Inadequate calorie intakeb. Inadequate calorie intake and inadequate carbohydrate storesc. Inadequate carbohydrate storesd. Inadequate fluid intake

Which of the following is a true statement about hypotheses? A. It is not possible to test hypotheses through scientific investigations. B. Even if hypotheses are not supported by data, they can still be valuable. C.

A homozygous recessive female mates with a heterozygous male. What percentage of the offspring could be homozygous dominant? a. 50% c. 0% b. 100% d. 25%

Which best describes the vulva? a) It is a muscular organ where a developing offspring grows. b) It is the external part of the female genital organs. c) It is the birth canal of the female reproductive system.

The diagram shows a simple lipid. What type of lipid is shown? saturated unsaturated phospholipid triglyceride