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What effect, if any, does an injection of testosterone have on a rat that was castrated during adulthood?

What blood type is the following?  

Your new patient has difficulty moving a finger rapidly between their nose and your outstretched finger, and they exhibit intention tremor.  Where do you think the brain damage might be?

The bicep is a (an) ________ muscle; and the tricep is a (an) ________ muscle.

During which of the following stages does the placenta and amniotic sac form?

What chamber of the heart receives oxygenated blood from the lungs?  

Which of the following is a hormone secreted by the posterior pituitary gland?

Which of the following evolutionary adaptations is typically only found in vertebrate species?

What blood vessel is the following in the picture below? (at the black arrow)  

Which of the following is matrix of blood?