The exact elevation at which the treeline occurs depends on the ____ and ____
a. temperature; distance from the sun
b. altitude; distance from the sun
c. elevation; annual precipitation
d. latitude; distance from the ocean
e. longitude; distance from the equator
d
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Like mitochondria, the inner membranes of chloroplasts are highly convoluted so as to greatly increase surface area
A. true B. false
Which is the last structure that a sperm travels through before it leaves the body?
a. ureter b. urethra c. vas deferens d. vas efferens e. epididymis
Which of the following molecules are often used as a cloning vector?
a. plasmids b. restriction enzymes c. recombinant DNA d. DNA fragments e. SNPs
Although energy flows in one direction in an ecosystem, nutrients ____ through an ecosystem
a. move from consumers to producers b. drive the energy flow c. build up d. deteriorate e. cycle