In a study of 39 species, the combined factors of body size and danger accounted for ___ of the variability in sleep time.
a. 35
b. 50
c. 75
d. 80
Question 2
Anecdotally, you may have heard that one of the commonly cited medical uses for marijuana is pain relief for cancer patients; this anecdotal evidence can be supported by findings that ___ can stimulate the ___.
a. Cannabinoids; primary somatosensory cortex
b. Cannabinoids; periaqueductal gray
c. Pot's opiates; spinal cord
d. Endorphins; release of endogenous cannabinoids
Body plan of a crustacean, as represented by a shrimp
European scops owl and the extinct Otus mauli species from Madeira.
Components of the Human Body
Orangutan males are twice the size and weight of females.
The skull of Sahelanthropus tchadensis is argued to be the earliest of the hominins and one of only
Movements of the Body