Which structure is the final layer for oxygen to encounter before diffusing into the bloodstream?

a. Surfactant Layer

b. Alveolar Space

c. Capillary Wall

d. Bronchioles

During a field trip, an instructor touched a moth resting on a tree trunk. The moth raised its forewings to reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings.

Animals contribute to soil formation through decomposition of organic material. True or false?

What can happen if an organism's population gets too big?

I tried to delete this question but it wont delete.

Which of the following allows a cell to become specialized?

If there is a possibility of four different genotypes in the offspring that result from a dominant-recessive inheritance, and if the couple has four children, would they definitely have children with one expressing each genotype?

The ovaries are located in the ___ cavity.

Transport of materials into a cell against a concentration gradient, from low to high, requires A) water. B) energy. Eliminate C) osmosis. D) a passageway.

As ocean water in a tide pool warms and evaporates, the remaining water becomes a. cooler. b. saltier. c. calmer. d. darker.

Drake is comparing time people spend playing games on Xbox versus Playstation. In his study, individuals ages 10 - 15 are given Xbox's and individuals ages 16 - 25 are given Playstations.