The passive movement of molecules from an area of higher concentration to an area of lower concentration is called _________.

A. diffusion
B. phagocytosis
C. active transport
D. endocytosis


A. diffusion

Biology & Microbiology

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During visual accommodation in mammals the ________ changes shape to focus light on the retina for a clear visual image

a. iris b. pupil c. lens d. cornea

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Members of the phylum ____ all have at some point during development a hollow dorsal nerve cord, a

perforated pharynx, a notochord, and segmented muscles in both the body wall and postanal tail.

a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata

Biology & Microbiology

Zygospores are used to resist harsh conditions.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Vessel elements must be thinner and shorter than tracheids because they lack the structural integrity to support large angiosperm trees

A. true B. false

Biology & Microbiology