The seeds of plants contain
A. ovules.
B. embryos
C. sepals.
D. both (A) and (B).

B.embryos

Explanation:

The seed basically contains three parts:

The embryo develops from a fertilized egg(zygote).The embryo consists of the epicotyl, hypocotyl, radicle and cotyledon(s).

The ovules and sepals are parts of a flowering plant.

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

the answer is d. chordata