Heterospory is believed to have led to the evolution of:

a. eggs.
b. seeds.
c. xylem.
d. phloem.
e. pollen.


b

Biology & Microbiology

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The two main factors controlling the density of water are:

a. salinity and temperature. b. salinity and heat capacity. c. salinity and pH. d. pH and heat capacity. e. temperature and pH.

Biology & Microbiology

Which part of the human brain is responsible for fine-tuning movements to maintain balance?

1.Cerebrum 2.Cerebellum 3.Hypothalamus 4.Medulla oblongata

Biology & Microbiology

The Earth has a constant tilt of _____ on its axis from its plant of orbit.

A. 12.5 degrees B. 23.5 degrees C. 30 degrees D. 9 degrees E. 5.5 degrees

Biology & Microbiology

A cladogram must contain a(n) ________ to serve as a baseline of comparison for the other groups.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology