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3 years ago

What are the factors that determine the level of harm an introduced chemical has on the environment?

Biology

2 answers:

Talja [164]3 years ago

8 0

Answer:

Dosage and form in which the chemical is present are the factors that determine the level of harm of chemical on the environment.

Explanation:

Dosage usually mean amount of chemical. Some chemicals cause harm to the environment in a very low amount and some chemicals damage the environment when the amount is too high, these chemicals are not considered as toxic. Form of chemicals also affects its toxicity. Some chemicals are harmful in one state and beneficial in another state.

vredina [299]3 years ago

7 0

Answer: Environmental toxicology is a multidisciplinary field of science concerned with the study of the harmful effects of various chemical, biological and physical agents on living organisms.[1][2] Ecotoxicology is a subdiscipline of environmental toxicology concerned with studying the harmful effects of toxicants at the population and ecosystem levels.

Rachel Carson is considered the mother of environmental toxicology, as she made it a distinct field within toxicology in 1962 with the publication of her book Silent Spring, which covered the effects of uncontrolled pesticide use. Carson's book was based extensively on a series of reports by Lucille Farrier Stickel on the ecological effects of the pesticide DDT.[3]

Organisms can be exposed to various kinds of toxicants at any life cycle stage, some of which are more sensitive than others. Toxicity can also vary with the organism's placement within its food web. Bioaccumulation occurs when an organism stores toxicants in fatty tissues, which may eventually establish a trophic cascade and the biomagnification of specific toxicants. Biodegradation releases carbon dioxide and water as by-products into the environment. This process is typically limited in areas affected by environmental toxicants.

Harmful effects of such chemical and biological agents as toxicants from pollutants, insecticides, pesticides, and fertilizers can affect an organism and its community by reducing its species diversity and abundance. Such changes in population dynamics affect the ecosystem by reducing its productivity and stability.

Although legislation implemented since the early 1970s had intended to minimize harmful effects of environmental toxicants upon all species, McCarty (2013[4]) has warned that "longstanding limitations in the implementation of the simple conceptual model that is the basis of current aquatic toxicity testing protocols" may lead to an impending environmental toxicology "dark age".

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Rabbit ear size tends to decrease as latitude increases. this is an example of _____. (concept 23.1)

crimeas [40]

Rabbit ear size tends to decrease as latitude increases. this is an example of a cline .

A cline can be described as a change of the biological trait of a species across its geographical range. A cline can be genetic for example, change in the allele frequency, or phenotypic (change in body size). The change can be shown as continuous gradation, or it can be more abrupt from one geographic region to the next.

8 0

3 years ago

How does the Endosymbiosis Theory describe the creation of Eukaryotic cells? *

nignag [31]

Answer:

Eukaryotic cells arose through endosymbiotic events that gave rise to the energy-producing organelles within the eukaryotic cells such as mitochondria and chloroplasts. ... The endosymbiotic theory proposes that one organism engulfed another, and the two co-evolved together until they could not exist independently.

Explanation:

8 0

2 years ago

agonists generally _______ activity at the synapse while antagonists generally ______ activity at the synapse.

ki77a [65]

Agonists activate the receptor thereby increasing activity at the synapse while antagonists generally prevent agonists from activating the receptors thereby decreasing activity at the synapse.

An agonist is the component that has the ability to increase the activity carried out by another substance.

The agonists work from their faculty of coupling to a cell-type receptor, in this way, they manage to generate a certain action in the cell.

The antagonists are the compounds that cause the opposite when they bind to the receptor, they cause a blockade by decreasing the activation of a synaptic receptor.

Therefore, we can conclude that agonists are compounds capable of increasing the action of synapse and blockers (antagonists) decrease activity at the synapse.

Learn more here: brainly.com/question/11985070

5 0

2 years ago

Glycolysis, the Krebs cycle, and the electron transport chain produce about 36 ----- molecules from one molecule of glucose. Ten

suter [353]

Answer:

ATP,NAD+,FAD,CO2

Explanation:

Glycolysis ,the krebs cycle and the electron transport chain produce about 36 ATP molecules from one molecule of glucose.Ten NAD+ molecules and two FAD molecules are reduced to transport H+ ions and electrons to the electron transport chain.Six molecules of CO2 are produced and released from the body as a waste product.

8 0

2 years ago

Which of the following descriptions about the organization of an ecosystem is correct? *

julia-pushkina [17]

Answer:

The description which is correct is:

Species make up populations which makes up communities.

Explanation:

In biology, species can be described as organisms which can interbreed to form fertile offsprings. Members of a species share many common characteristics. Example of species includes all human beings on earth.

In biology, a population can be described as the number of organisms of a species which are living together in a habitat at a particular time. These organisms have the capability to interbreed and produce fertile offspring.

The organisms present in different populations in an area at a particular time make up a community. For example, a population of birds, a population of insects, a population of plants that live in a certain area at a particular time make up a community.

8 0

2 years ago