Lactobacillus acidophilus is a bacterial species that typically lives in the human gut and breaks down lactose into smaller, digestible molecules. An estimated 65% of adult humans cannot break down lactose by themselves. What kind of relationship does this bacterium have with humans?

Which of the following is an example of a -/- interaction?

Which of the following methods would most accurately count the number of animals if the animals are easily visible and do not move?

In the graph to the right, which dotted line would best represent carrying capacity? carrying capacity graph 2.png

The term used to describe a harmless organism resembling a harmful one is _____.

Which of the following is true about interspecific interactions?

The figure to the right shows the numbers of roly-poly bugs counted in 5 random 20cm2 plots out of a 60cm2 area of grass. Using the sampling method, what would you estimate to be the population density of roly-poly bugs in the 60cm2 area of grass? population density 1.png

Which of the following is an example of a behavioral defense?

Which of the communities below have the lowest species richness? Assume that bugs with different shapes represent different species. species richness 1.png

What is the largest biome on Earth?