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boyakko [2]
3 years ago
10

A key characteristic of aquatic dead zones is ________. A key characteristic of aquatic dead zones is ________. a high concentra

tion of urban development a low concentration of oxygen low concentrations of nitrogen and phosphorus a lack of water a low concentration of keystone species
Biology
1 answer:
Snowcat [4.5K]3 years ago
6 0

Answer:

The correct answer is "low concentration of oxygen".

Explanation:

One of the key characteristic of aquatic dead zones is its low concentration of oxygen. Aquatic dead zones are classified into this category for being hypoxic, condition that do not support the growth of most marine life. Most aquatic dead zones are in these conditions because of a high content of nutrient pollution caused by human activities.

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In an investigation of the cycling of environmental gases, a
pav-90 [236]

Answer:

D) It would contain less nitrogen.

Explanation:

In an investigation of the cycling of environmental gases, a  student placed water and bromthymol blue in each of four test  tubes as shown in the diagrams below. No additional items were  placed in tube 1, a snail was placed in tube 2, an aquatic plant  (elodea) was placed in tube 3, and both a snail and an elodea  were placed in tube 4. The tubes were then stoppered and placed  in bright light for 24 hours. The solution in tube 3 changes after 24 hours because it would contain less nitrogen.

The dfferent tubes are shown in the picture that I uploaded.

5 0
3 years ago
The autorhythmicity of cardiac pacemaker cells is made possible by the reduced permeability of _______. The autorhythmicity of c
vichka [17]

Answer:

<h2>potassium</h2>

Explanation:

The heartbeats of the heart are controlled by the sinoatrial node also known as the pacemaker of the heart. The impulse is generated in the conducting cells of the pacemaker as a result of the movement of sodium, potassium and calcium ions.

The sodium channels allow the movement of sodium into the cell which depolarizes the membrane from -60mv to -40 mv. At this point, the calcium gated channels open which allow the entry of the calcium in the cell which depolarizes the cell up to +5mv.

At this point, the potassium channels open which allows the potassium ions to move out of the cell. This repolarizes the cell and hence the cycle again begins.  Reducing the permeability of the potassium ions help generate the autorhythmicity due to repolarization and thus is the correct answer.

7 0
3 years ago
The nutrients which serve as the main sources of energy for the body are
puteri [66]
Complex carbohydrates Such as insoluble fiber. Your body will break that down first because I is much faster than other source to convert to energy. If there isn't any carbs available your body will then convert fat into energy and lastly if there is t and carbs or fat your body will then breakdown protien into energy but that is truly the last resort. Sorry for the errors in this texts I was writing very fast and my phone will not allow me to edit.
5 0
2 years ago
PLEASE HELP, PROGRESS REPORTS ARE COMING. when examining cells with a microscope, you can see the outlines of plant cells easily
schepotkina [342]

It’s because plant cells have a cell wall and animal cells don’t

7 0
3 years ago
(word bank)
malfutka [58]
I’m too certain but i believe the answer is recreation
8 0
2 years ago
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