Snapdragons show incomplete dominance. RR = red and rr = white (red + white = pink). Which phenotypic ratio would be expected in the offspring of one pink and one red flower?
1 RR : 2 Rr : 1 rr

0 red : 4 pink : 0 white

0 RR : 2 Rr : 2 rr

2 red : 2 pink : 0 white

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

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what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements