Grizzly bears have large geographic ranges that consist of mosaics of forests and grasslands at varying altitudes. Grizzlies also require relatively pristine water sources in their range. Based on this, what species type best describes grizzly bears?
A. indicator species.
B. keystone species.
C. endemic species.
D. flagship species.
E. umbrella species.
E. umbrella species.
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Place the following in the correct order of the
structures blood flows through beginning with the arrival of blood at the vena cavae and ending with the blood flowing to the lungs. 1. right atrioventricular valve 2. pulmonary artery 3. right ventricle 4. right atrium 5. pulmonary valve
a. 4-3-5-2-1 b. 4-1-3-5-2 c. 4-2-3-1-2 d. 3-1-4-5-2 e. 3-2-4-5-1
A sea urchin is a member of the phylum
A) Echinodermata. B) Mollusca. C) Annelida. D) Platyhelminthes. E) Arthropoda.
What relationship between LDLs and HDLs is the healthiest?
A) high levels of LDLs and low levels of HDLs B) low levels of both HDLs and LDLs C) low levels of LDLs and high levels of HDLs D) high levels of both HDLs and LDLs
A virologist wants to observe the three-dimensional surface features of virus particles she is studying. Which of the following microscopes would be most useful for her observations?
A. differential interference contrast B. atomic force C. scanning electron D. transmission electron E. atomic force or scanning electron