Gray whales echolocate at frequencies up to 200kHZ in the water.  The distance between their ears is about 9m.  A sound made at 20Hz produces a wavelength of what in water?  Would gray whales be able to localize this sound using intensity cues, phase differences or neither?  (Remember that speed of sound in water is 1350m/s).

If the speed of sound is 330 m/s and an echo is heard of 0.75s, how far away is the echo source? (Make sure to write out how you calculated it)

(A) Nycteris is a carnivorous bat that ‘gleans’ prey such as frogs and lizards from the ground.  (B) Plecotus, the long-eared bat specializes on non-flying prey from leaves on trees.   (C) The Mexican free-tailed bat, Tararida forages insects high above the canopy. (D) Some species of Eptesicus, the big brown bat, forage for insects in small open clearings. For the four bat genera described above, describe a “typical” echolocation pattern for each bat in terms of where they forage and explain why they use the particular echolocation pattern for their foraging bouts.

What is social work?

What is the meaning of the term ‘feminization of poverty’?

Which trait(s) below does a subordinate male mongoose have to consider with respect to attempting reproduction.

The working poor refers to individuals who are employed but still live below the poverty line due to low wages and unstable work conditions. (True/False)

Daily health checks can be a valuable method for involving families in children’s preventive health care.

Teachers should correct children’s inappropriate table manners and make sure they finish a meal in the allotted time.

A 2-year-old’s vocabulary should consist of about 50 to 300 words.