Marine ecosystems cover approximately 71% of the Earth's surface and contain approximately 97% of the planet's water. They generate 32% of the world's net primary production. They are distinguished from freshwater ecosystems by the presence of dissolved compounds, especially salts, in the water. Approximately 85% of the dissolved materials in seawater are sodium and chlorine. Seawater has an average salinity of 35 parts per thousand(ppt) of water. Actual salinity varies among different marine ecosystems.
A classification of marine habitats.
Marine ecosystems can be divided into many zones depending upon water depth and shoreline features. The oceanic zone is the vast open part of the ocean where animals such as whales, sharks, and tuna live. The benthic zone consists of substrates below water where many invertebrates live. The intertidal zone is the area between high and low tides; in this figure it is termed the littoral zone. Other near-shore (neritic) zones can include estuaries, salt marshes, coral reefs, lagoons and mangrove swamps. In the deep water, hydrothermal vents may occur where chemosynthetic sulfur bacteria form the base of the food web.
Classes of organisms found in marine ecosystems include brown algae, dinoflagellates, corals, cephalopods, echinoderms, and sharks. Fishes caught in marine ecosystems are the biggest source of commercial foods obtained from wild populations.
Environmental problems concerning marine ecosystems include unsustainable exploitation of marine resources (for example overfishing of certain species), marine pollution,climate change, and building on coastal areas.
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Answer:
<h2>The virus is a bacteriophage that is reproducing the lysogenic cycle.</h2>
Explanation:
When bacteriophage infect the bacteria, it can enter one of two cycles i) lytic or ii) lysogenic cycle.
In lysogenic cycle, virus injects its genome into the bacterial chromosome, known as prophage and it replicates with bacrerial DNA. When conditions change, this prophage can remove itself from the bacterial DNA , and lysogenic cycle can change into lytic cycle.
<span>Vegetative propagation is the process of growing a new plant from parts of another plant. This can be done in a number of ways, the most common being cutting. Cutting can allow for the plant to develop roots in the part that was cut off.</span>
1. The phrase Darwin used to describe his broad theory of evolution is ''descent with modification.
2. All of life is related through common ancestry, accounting for the Unity.
