Answer:
Less oxygen dissolved in the water is often referred to as a “dead zone” because most marine life either dies, or, if they are mobile such as fish, leave the area. Habitats that would normally be teeming with life become, essentially, biological deserts.
Hypoxic zones can occur naturally, but scientists are concerned about the areas created or enhanced by human activity. There are many physical, chemical, and biological factors that combine to create dead zones, but nutrient pollution is the primary cause of those zones created by humans. Excess nutrients that run off land or are piped as wastewater into rivers and coasts can stimulate an overgrowth of algae, which then sinks and decomposes in the water. The decomposition process consumes oxygen and depletes the supply available to healthy marine life.
Dead zones occur in coastal areas around the nation and in the Great Lakes — no part of the country or the world is immune. The second largest dead zone in the world is located in the U.S., in the northern Gulf of Mexico.
Explanation:
An area where there is less dissolved oxygen in the water is frequently referred to as a "dead zone" since most marine life there either perishes or, if it is mobile, like fish, leaves.
What is Dead zones?Habitats that would often be abundant with life end up being biological deserts. While hypoxic zones can exist naturally, researchers are worried about any that have been induced or made worse by human activity.
Nutrient pollution is the main reason for human-made dead zones, while other physical, chemical, and biological elements also contribute to their creation.
Excess nutrients that are dumped into rivers and beaches as wastewater or that flow off the land can promote an overgrowth of algae, which sinks and decomposes in the sea. Decomposition consumes oxygen and depletes the soil of nutrients.
Therefore, An area where there is less dissolved oxygen in the water is frequently referred to as a "dead zone" since most marine life there either perishes or, if it is mobile, like fish, leaves.
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Please respond!!!
to the following prompt in a minimum of 5 complete and grammatically correct sentences, Your responses should be in your own words. You may use the internet for background information. Please cite your sources in order to receive full credit.
Describe three characteristics of the mammalian brain that differ from other vertebrates.
Answer:
this may help
"The presence of hair, composed of the protein keratin, is one of the most obvious characteristics of mammals. Although it is not very extensive or obvious on some species (such as whales), hair has many important functions for most mammals. Mammals are endothermic, and hair traps a boundary layer of air close to the body, retaining heat generated by metabolic activity. Along with insulation, hair can serve as a sensory mechanism via specialized hairs called vibrissae, better known as whiskers. Vibrissae attach to nerves that transmit information about tactile vibration produced by sound sensation, which is particularly useful to nocturnal or burrowing mammals. Hair can also provide protective coloration or be part of social signaling, such as when an animal’s hair stands “on end” to warn enemies, or possibly to make the mammal “look bigger” to predators.
Unlike the skin of birds, the integument (skin) of mammals, includes a number of different types of secretory glands. Sebaceous glands produce a lipid mixture called sebum that is secreted onto the hair and skin, providing water resistance and lubrication for hair. Sebaceous glands are located over most of the body. Eccrine glands produce sweat, or perspiration, which is mainly composed of water, but also contains metabolic waste products, and sometimes compounds with antibiotic activity. In most mammals, eccrine glands are limited to certain areas of the body, and some mammals do not possess them at all. However, in primates, especially humans, sweat glands are located over most of the body surface and figure prominently in regulating the body temperature through evaporative cooling. Apocrine glands, or scent glands, secrete substances that are used for chemical communication, such as in skunks. Mammary glands produce milk that is used to feed newborns. In both monotremes and eutherians, both males and females possess mammary glands, while in marsupials, mammary glands have been found only in some opossums. Mammary glands likely are modified sebaceous or eccrine glands, but their evolutionary origin is not entirely clear.
The skeletal system of mammals possesses many unique features. The lower jaw of mammals consists of only one bone, the dentary, and the jaw hinge connects the dentary to the squamosal (flat) part of the temporal bone in the skull. The jaws of other vertebrates are composed of several bones, including the quadrate bone at the back of the skull and the articular bone at the back of the jaw, with the jaw connected between the quadrate and articular bones. In the ear of other vertebrates, vibrations are transmitted to the inner ear by a single bone, the stapes. In mammals, the quadrate and articular bones have moved into the middle ear ((Figure)). The malleus is derived from the articular bone, whereas the incus originated from the quadrate bone. This arrangement of jaw and ear bones aids in distinguishing fossil mammals from fossils of other synapsids.
Mammals, like birds, possess a four-chambered heart; however, the hearts of birds and mammals are an example of convergent evolution, since mammals clearly arose independently from different groups of tetrapod ancestors. Mammals also have a specialized group of cardiac cells (fibers) located in the walls of their right atrium called the sinoatrial node, or pacemaker, which determines the rate at which the heart beats. Mammalian erythrocytes (red blood cells) do not have nuclei, whereas the erythrocytes of other vertebrates are nucleated. "
Explanation:
does yeast become active with sugar or with warm water and sugar?
Answer:
Add yeast to the water, then feed it sugar and stir it together.
Photosynthesis occurs in the ____layer of the leaf, which contains the organelle called ____ . This photosynthetic organelle contains the pigment
organized into photosystems.
Inside this organelle, there are two important regions. The______ are flat pancake-like structures that are organized into stacks called grana. The space between the stacks is called the______
Which of the following accounts for the largest amount of biomass in our oceans?
a. Plankton
b. neckton
c. dinoflagellates
d. mammals
