1. which does not describe the ocean bottom? dark cold quiet lifeless 2. which area would have the highest salinity? an area with plenty of runoff an area with high rates of precipitation an area with high rates of evaporation 3. at a hydro thermal vent, seawater seeps into the ocean floor through cracks in the crust seawater seeps out of the ocean floor through cracks in the crust bacteria and other organisms die due to lack of nutrients 4. what are the three main zones of the open ocean? pycnocline zone, transition zone, cold-water zone surface mixed zone, pycnocline zone, deep zone surface mixed zone, transition zone, deep zone 5. all the complex feeding relationships among a number of different organisms make up the ecosystem food web food chain 6. which ocean zone does sunlight penetrate? photic zone neritic zone abyssal zone aphotic zone description

1. lifeless

initially, it is predicted that the ocean bottom would be lifeless since the sun light cannot reach this area. But in the 1970s, we found colonies of shrimp who manage to survive in the ocean bottom despite the lack of sun. They utilize mineral deposits in the ocean bottom to survive.

2. an area with high rates of evaporation

Salinity refers to how much salt is dissolved in the water. Salt does not evaporate like water does in heat. Because of this, in area with high rates of evaporation, each volume of water contain larger number of salt, resulting in high salinity.

3. seawater seeps into the ocean floor through cracks in the crust

Hydro thermal vent refers to  place where geothermal heated water  is created from. In this are,  tectonic plates are constantly moving apart from the center. The movements of the tectonic plates create a cracks in the ocean floor where sweater can seeps into.

4. surface, pycnocline, deep

the surface area includes the ocean's surface until the area with 200m depth. This surface area contains the most sunlight phytoplanktons.

Polyclinic extend from 200m depth into 1000m. In this area, there is not much sunlight can come in and the water tend to be in higher density compared to surface area.

Deep ocean extend from 1000 depth and below. In this area, there isn't any sunlight

5. food web

Food web refers to a collection of several food chains within one ecological community. In the food web, organisms are divided into two categories.

1) the autotrophs, whcih is the organisms that can obtain energy by producing their own food.

2) the heterotrophs, which is organisms that had to obtain their energy by consuming other organisms.

6. photic

The pothic zone is the area in the ocean that get the largest amount of sunlight. The sunlight allow large amount of zooplankton to conduct their photosynthesis. Since majority of ocean lives consume zooplankton as their main source of food, the photostatic zones contains highest amount of marine fishes

developed and developing countriescountries are divided into two major categories by the united nations, which are developed countries and developing countries. the classification of countries is based on the economic status such as gdp, gnp, per capita income, industrialization, the standard of living, etc. developed countries refers to the soverign state, whose economy has highly progressed and possesses great technological infrastructure, as compared to other nations.

(4,-2)

explanation:

6x+4y=16

-6x-9y=-6

-5y=10

y=-2

x=4