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 In the classification of joints, which of the following is true?

Which true about light in aquatic environments?A) Water equally reflects and absorbs all wavelengths of light.B) Longer wavelengths penetrate to greater depths.C) The zone where light stops penetrating is call aphotic.D) Most photosynthetic organisms avoid the surface where the light is too intense.

Which of the following do scientists believe migrating birds use? [a]________.I) the stars in the night skyII) the sun during the dayIII) the magnetic field of the EarthA) only IB) only IIC) only IIID) I, II, and III

Every lever system has a lever, which is a rigid bar or rod. In human lever systems (part of the muscular and skeletal systems) what anatomical part functions as the lever?

Below are sketches of histograms for three lists. In scrambled order, the averages are 40, 50, 60.  Match the histograms with the description: 

Typically, organizations in the U.S. emphasize the importance of the ______.  Organizations in Japan emphasize the importance of the ______.

The highest degree of cephalization is reached in Homo sapiens, what is cephalization [a]A) having a backboneB) having a sedentary lifestyleC) having a sessile existenceD) a concentration of sensory structures at the anterior endE) being predatory 

What separates the higher primates from all other mammals?

Heartworms can accumulate within the hearts of dogs and other animals, to which phylum do heartworms belong?

What are hyphae? [a]A) a symbiotic association between plant roots and fungiB) threadlike filaments that make up fungal bodies that may or may not have septaeC) fungal sporesD) chemicals secreted by sexually reproductive fungal E) organelles where ATP is synthesized