A 50-year-old man came to the emergency department after returning from foreign travel. His symptoms included persistent diarrhea (over the past 3 days) and rapid respiration (tachypnea). Blood gases were drawn: pH: 7.21 , PC02 :19 mm Hg (normal range 35-45), P02 : 96mm Hg (normal range 80-110), HCO3-: 7 mmollL ( normal range 22-36)1. a. What is the patient's acid-base status? b. Why is the HCO3-level so low? c. Why does the patient have rapid respiration?

There are 6.022 x 10^23 atoms of hg in 1 mole of hg. the number of atoms in 4.5 moles of hg can be found by multiplying 4.5 by 6.022 x 10^23 a. 2.7 x 10^24 b. 27 x 10^23 c. 2.71 x10^24 d. 27.099 x 10^23

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial