Which kind of twins always results when two different sperm fertilize two eggs?

What is the phone number to call for poison control (for humans) in the uk (specifically london)?

Cardiovascular efficiency, muscular strength and endurance, flexibility, and body composition are all related factors.

Which describes the effect of prolonged stress on blood pressure? it causes blood pressure to decrease. it has little or no effect on blood pressure. it causes the heart to pump with more force. it causes blood pressure to increase.