Directions: Rewrite the sentences using the present perfect. Ivan lived in the U.S. for ten years. There was a lot of snow in Boston this month. 

Directions: Choose the correct answer from the drop-down menu to complete the sentence.  The weather has been very rainy two weeks. This is the rainiest April we’ve had 1999.

After bicarbonate ions are produced in the erythrocyte, it moves into the plasma and is exchanged with  a _____ to keep electrical neutrality.

Select all correct answers. Why does the left ventricle have a thicker myocardial wall?

Mechanical digestion

Mrs. Smith needs a blood transfusion. She has O positive blood. What type(s) could she safely be given?

Directions: Fill in the simple past tense and past participle of each verb. Present Simple Past Past Participle write do give think hear

________typically stains pinkish/orange and helps to lessen an allergic reaction through the secretion of histaminase.

The effects initiated by the endocrine system _______ those of the nervous system.

Which of the following is incorrectly paired with its location or enzyme?