The answer is; activation
The second phase of defense is called the adaptive immune response. It involved the recruitment of white blood cells (leucocytes) (mainly the B- and T- cells). The innate defense system, which is the first response to an invading pathogen, involves the body’s physical barriers such as the skin and mucous membrane.
Ecotourism is when people are encouraged to tour natural environments, often of endangered species, in order to observe wildlife. You see, when people can see the beautiful places in nature that are at risk, they will work to conserve the environments. Transportation through these places uses the land as a resources without taking anything from it. Non-Extractive Resources are pieces of land and places in nature that benefit the economy without people extracting resources or artificially developing things within the ecosystems.
Metals on the ocean floor aren't renewable. They are formed over long periods of time, and the organisms that feed on them will become extinct without it. For example, iron is one of the most heavily mined metals in the ocean, as well as a primary food source for phytoplankton—who are one of the species at the base of the marine food pyramid, meaning they are essential to the survival of other species.
Answers:
1. Ecotourism
2. <span>Alteration in seafloor sediments rich in carbon would cause loss of species and an unbalanced population in marine food webs.
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Hope this helps!
The Bottom Line. Dunes and ripples are both bedforms: piles of stuff that is moved along the ground by the wind (or by some fluid, like water). They are formed in different ways, taking anywhere from minutes to millennia to respond to changes in wind patterns
Answer:
A. All matter in the universe has expanded outward from a single point.
