What causes oxygen to diffuse into the blood from an alveolus (air sac) in the lungs? A) The oxygen concentration in the alveolus is higher than in the atmosphere.
B) The oxygen concentration in the alveolus is lower than in the blood.
C) The oxygen concentration in the atmosphere is higher than the carbon dioxide concentration.
D) The oxygen concentration in the blood is lower than in the alveolus.

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. threat method number of species that benefit number of years to see benefit habitat fragmentation reforestation 450 8 introduced prey species biological augmentation 150 2 which statement is an accurate explanation of the information in the table? a. biological augmentation would benefit only a few species because it is typically not very effective. b. biological augmentation would take less time to be effective because it targets the majority of prey species. c. reforestation would take the longest time to be effective because trees take several years to grow. d. reforestation would not benefit many species because most forest species live on the ground.

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.