Which developmental events are accurately placed in the following timeline? (Check all that apply.)  

_____  after 6 days -- implantation
_____  after 1 week -- gastrulation
_____  after 2 weeks -- neurulation
_____  after 3 months -- organogenesis
_____  266 days -- birth


__X__  after 6 days -- implantation
__X__  after 1 week -- gastrulation
__X__  after 2 weeks -- neurulation
_____  after 3 months -- organogenesis
__X__  266 days -- birth

Biology & Microbiology

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New species evolve from pre-existing species by the accumulation of

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Biology & Microbiology

Which pollutant would most likely be the source of coliform bacteria in a stream?

a. fertilizers from a golf course. b. discharge from a factory. c. forestry activities. d. sewage or animal wastes.

Biology & Microbiology

Why is it advantageous for cells to be small?

a. A small cell size prevents a cell from weighing too much. b. A small cell is better able to conserve energy than a larger cell. c. A small cell size occupies less space in nature where space is limited. d. A small cell has a small surface area relative to volume, thereby facilitating ion balance. e. A small cell has a small volume relative to surface area, thereby increasing efficient transport

Biology & Microbiology

Phospholipids are made up of:

A. five-carbon rings with two nonpolar tails. B. a glycerol and three fatty acids. C. four fused carbon rings. D. a phosphate, two fatty acids and a glycerol.

Biology & Microbiology