What direct effect do histamines and leukotrienes have on capillaries?

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse

Which level of taxonomy has the fewest organisms?

What is the most common structure of volcanoes?