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guapka [62]
2 years ago
7

A scientists wishes to determine whether or not a marine ecosystem underwent primary or secondary succession in the past. What e

vidence would be most useful for making this determination?
Unearth the fossil history of the ecosystem to find producers that can live on rock.
Use radiocarbon dating to determine the age of the rock underlying the ecosystem.
Determine the average age of all producer species in the ecosystem at the present time.
Determine the chemical composition of the water in the ecosystem at the present time.
Biology
1 answer:
Triss [41]2 years ago
7 0
I believe the correct answer from the choices listed above is the second option. The evidence that would be most useful for making this determination would be to u<span>se radiocarbon dating to determine the age of the rock underlying the ecosystem.</span>. Succession<span> is usually initiated by a significant disturbance of an existing community. Hope this answers the question.</span>
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One critical observation used by both lamarck and darwin in their research is
Ymorist [56]
One critical observation used by both Lamarck and Darwin in their research is about characteristics of inheritance. Although each claimed different sources of inheritance, they were in unison that in time, individuals acquire characteristics called inheritance. Lamarck believed that inheritance is passed from parents to offspring, while Darwin thought that it’s a product of natural selection.
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2 years ago
Propose a hypothesis for the investigation. When taken out of the freezer and placed on a piece of foil, will the two pieces of
xxMikexx [17]
When taken out of the freezer and placed on a piece of foil, 2 pieces of ice will melt at the same rate because the piece of foil is at room temperature and so are the pieces of ice.



That's the best way that I can explain it :)
7 0
2 years ago
Different parts of the human digestive system help to break down molecules of fat so
slavikrds [6]

Answer:

Small intestine, liver, bile and lipase.

Explanation:

Digestion of fat occurs in the small intestine. Its digestion occurs with the help of bile, that is made in the liver. Bile breaks the fat into small drops that are easier for the lipase enzymes to change it. Lipase enzymes is a type of enzymes that works only on lipids and lipids are broken down into fatty acids and glycerol. These substances are absorbed by our body and used it for producing ATP for the body.

5 0
2 years ago
20 POINTSS!!!!
Ahat [919]

Answer:

The innate or nonspecific immune system includes two lines of defense in the human body. Non-specific means that it does not act on the specific pathogen. It works equally to keep all types of pathogens such as bacteria, viruses, parasites et cetera out of the body.

The first line of defense includes physical barrier which prevents the entry of pathogens into the body. It includes skin, respiratory tract, gastrointestinal tract, cilia, nasopharynx, eyelashes, and body hairs.

It also includes chemical barriers such as mucus, gastric acid, bile, tears, sweat,  and saliva.

The second line of defense includes anti-inflammatory responses, fever, and nonspecific cellular responses such as phagocytes, macrophages, complement system et cetera.

Thus, the virus has to pass physical, chemical, and nonspecific cellular responses of the body in order to infect the body.

5 0
2 years ago
There are three essential components of all homeostatic control mechanisms; control center, receptor, and effector. The __(1)___
tresset_1 [31]

Answer:

The receptor senses changes in the environment and responds by sending information (input) to the control center along the ascending pathway. The control center  analyzes the input, determines the appropriate response, and activates the effector by sending information along the descending pathway. When the response causes the initial stimulus to decline, the homeostatic mechanism is referred to as a negative feedback mechanism. When the response enhances the initial stimulus, the mechanism is called a positive feedback mechanism. Negative feedback, mechanisms are much more common in the body.

Explanation:

Homeostasis is the adaptation of living organisms or systems to new conditions in the environment by auto-regulation. Through this mechanism, an equilibrium state can be maintained in spite of any changes. This adjustment in the physiological system is called <em>homeostatic regulation</em> and it is composed of three parts: the receptor, the control center, and the effector.

The receptors receive information from the environment about something changing and transmit that information to the central nervous system (control center). This pathway is defined as the ascending pathway. Information is processed in the control center which handles many sensory signals, evaluates them, compares them and uses them for decision making. After that, an efferent neuron is stimulated to carry information from the central nervous system to the effector cells of the target organ. The effector may be muscle or glandular tissue. This pathway is defined as the descending pathway. Finally, the target organ responds.

There is negative feedback when the response declines the initial stimulus, which is the <u>most common mechanism</u> in the body. There is positive feedback when the response enhances the initial stimulus, which might be very nocive to the organism.

5 0
2 years ago
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