Are you convinced that herbicides are affecting egg development in frogs?

In the scale-eating cichlid, two jaw morphologies exist.  Left-jawed morphs are more successful when they are rare and right-jawed morphs are abundant, and right-jawed morphs are more successful when they are rare and left-jawed morphs are abundant.  Thus changes in the proportion of each morph in the population is constantly changing, and at some proportion, both morphs are equally successful.   The existence of two jaw morphologies in the scale-eating cichlid is an example of 

Which of the following is an example of a question about the proximate cause of a behavior?

Nearly all owls hunt at night and many can capture prey in total darkness. Check the example of a question about the ultimate cause of night hunting in owls. 

They slow dow the heart rate:

A phylogeny of felids is shown above.  In this phylogeny which felids are sister species?  Check all that apply.

What is the muscle indicated by the tip of the arrow?  

Predictions from a mathematical model (from Lima et al. 1985) were tested using an experiment that manipulated the size of food items and the distance of food items from trees.  Results from the experiment are shown in the figure below.  Which of the following is TRUE about the results?

Suppose you were interested in whether the concentration of herbicides in pond water affected egg development in frogs.  You measure herbicide concentration and egg developmental success in 10 ponds that are similar in size and location, and you plot your data on a graph.  Of the figures above, which plot would suggest a negative correlation between herbicide concentration and egg developmental success.  

In this type of contraction, muscle develops enough tension to lift a load.