The human skeleton is a typical vertebrate  

A.  exoskeleton.
B.  hydrostatic skeleton.
C.  axial skeleton only.
D.  endoskeleton.
E.  appendicular skeleton only.


D.  endoskeleton.

Biology & Microbiology

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Water potential (?) can be thought of as the tendency for water to move from one place to another. In plants, it is made up mainly of solute potential and pressure potential

Hypothetical plant cells A and B are adjacent to each other. The solute potential (?S) of cell A is -0.35 MPa, and its pressure potential (?P) is +0.15 MPa. The solute potential (?S) of cell B is -0.30 MPa, and its pressure potential (?P) is +0.05 MPa. In which direction will net water movement occur? A) Neither; cells A and B are in equilibrium with each other. B) from cell A to cell B C) from cell B to cell A

Biology & Microbiology

Oxygen and carbon dioxide move across a cell membrane by the process of active transport

a. true b. false

Biology & Microbiology

Which material in skin provides protection from abrasions, water damage, and microorganism entry?

A. Sweat B. Salt C. Lysozyme D. Sebum E. Keratin

Biology & Microbiology

A mutation can be the cause for

A) sperm and egg formation. B) growth and development. C) sexual reproduction. D) environmental change. E) natural selection.

Biology & Microbiology