what is the natural rate of nitrogen fixation in earth’s ecosystems?

Answers

Answer 1

Answer:

A reasonable upper bound for the rate of natural nitrogen fixation on land is thus about 140 Tg of N per year.


Related Questions

The skin is the body's largest organ. It's made up of many different types of cells.

a. True
b. False

Answers

A. TRUE
The skin is the largest organ of the body. ... It protects the body from external factors such as bacteria, chemicals, and temperature. The skin contains secretions that can kill bacteria and the pigment melanin provides a chemical pigment defense against ultraviolet light that can damage skin cells.

The image shows a facility that converts the energy of moving water into
electrical energy. What is one advantage of using this technology in place of a
coal-burning power plant?
A. It produces more water pollution.
B. It causes no harm to ecosystems.
C. It does not emit greenhouse gases.
D. It is fueled by a nonrenewable resource.

Answers

Answer:

C. It does not emit greenhouse gases.

The one advantage of using this technology in a coal-burning power plant is that it does not emit greenhouse gases. Therefore, option C is correct.

How does electrical energy formed from moving water?

Electrical energy can be generated from moving water through a process called hydroelectric power generation. Hydroelectric power plants use the kinetic energy of moving water to spin turbines, which in turn generate electricity.

Hydroelectric power generation is a renewable source of energy that produces no carbon emissions or air pollution. It is one of the most widely used forms of renewable energy, providing electricity to millions of people worldwide.

However, the construction of dams and reservoirs can have significant environmental impacts on the surrounding ecosystems and habitats. Hence, option C is correct.

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Looking at the aquatic food web below, where is energy starting in the food web

A. Seagull, penguin, and elephant seal
B. Phytoplankton and seaweed
C. Blue whale and killer whale
D. Crabs, krill, Fish

Answers

Answer:

Pretty sure it's B

Explanation:

Use the graph below to explain the ideal conditions for the enzyme it represents.

Answers

Answer:

Explain the effect of temperature on the relative rate of action of an enzyme is represented in the graph below: b) What is the optimum temperature (approximate) for the action of this enzyme? 6 0 L } 10 20 30 40 50 60

the energy required for a seedling to push up out of the ground comes from

Answers

Answer:

Food Storage in the Seed

Explanation:

Seeds require oxygen in order to create energy for germination and development. The embryo obtains energy by decomposing its dietary reserves. This is accomplished, as in other creatures, by a process called as aerobic respiration. —a sequence of processes in which energy is released from glucose using oxygen.

An example of abiotic factors influencing marine organisms is:
*
O predation
competition for food,
parasitism.
salinity.
bacterial disease.

Answers

Answer:

parasitism

Explanation:

Which part of the plant releases energy from food

Answers

The Mitochondria of a plant cell releases energy from the food. It is a cell organelle and is present in the cytoplasm. They make most of the essential ATPs (Adenosine Tri Phosphate).

what do you think whould be the function of each of these cell parts in an animal cell​

Answers

Which cell parts?

Cell is the smallest unit of life.

Explain the importance of proteins in our body

Answers

It helps repair and build your body's tissues, allows metabolic reactions to take place and coordinates bodily functions.

Addition to providing your body with a structural framework, proteins also maintain proper pH and fluid balance.

the process of activating photoreceptors by altering the photopigments is known as __________.

Answers

The process of activating photoreceptors by altering the photopigments is known as PHOTOTRANSDUCTION. It involves the mechanism by which light can be converted into electrical signals.

Phototransduction refers to the mechanism by which light can be converted into electrical signals.

Visual phototransduction occurs in the part of the eye known as the retina, in specific cells called photoreceptors and ganglion cells.

Photoreceptor cells include rod cells and cone cells, which are sensitive to light.

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In mitosis the daughter cells are identical to the parent cell. How do the cells produced during meiosis differ from those produced from mitosis

Answers

Answer:

The cells produced during mitosis are identical but cells produced in meiosis are different.

Explanation:

This is because in mitosis, there is no crossing over, but crossing over occur in meiosis. During crossing over, there is swapping of the genetic material.

The lowest range of dissolved oxygen levels which will support a diverse population of organisms is:

The lowest range of dissolved oxygen levels which will support a diverse population of organisms is:
A. 2-3 ppm
B. 4-5 ppm
C. 6-7 ppm
D. 8-9 ppm

Answers

Dissolved oxygen can range form 0-18 mg/L, but most natural water systems require 5-6 mg/L to support a diverse aquatic population. 2. A dissolved oxygen level of 9-10 mg/L is considered very good. Generally, a higher dissolved oxygen reading indicates a better water quality.

A person with swollen gums rinses their mouth out with salt-water. Will this decrease the swelling or increase the swelling ? What will happen?

Answers

Answer:

I believe it would decrease the swelling. Salt water is good for swelling gum's.

Explanation:

Which organisms "invented" (were the first to use) fermentation?

a
fungi
b
plants
c
bacteria
d
animals

Answers

Answer:

bacteria

Explanation:

because they are the one that still been in use

How do organisms depend on and compete for biotic and abiotic factors?

Your answer should include at least 6 sentences to explain the claim, evidence and reasoning.​

Answers

Answer:

Organisms depend on and compete for both biotic and abiotic factors in an ecosystem. A few abiotic factors are sunlight, water, and territory. Plants compete for sunlight and water, and they depend on those factors for their survival. Biotic factors would include plants, bacteria, and other animals. Consumers of these biotic factors compete for them because they depend on them for their survival.

Explanation:

;)

If red blood cells are placed in distilled water and examined under a microscope
no cells are seen.
Explain why no red blood cells would be seen

Answers

Answer:

The distilled water made the red blood cells burst.

Explanation:

Distilled water is a hypotonic solution containing ZERO salt content. It is 100% water, making the red blood cells (RBC) take in water that causes the RBC to swell, then burst.

can someone help me with this question plss

Answers

Answer:

unkown

Explanation:

0
다.
II
2
3
5
101
1
Using the alleles A and a, what is the genotype of individual
a) 11-6
b) 1-4
11-7

Answers

Answer:

what is that supposed to be? maybe a pic of the question?

What is the age of a meteorite if potassium-40 decayed from 80 g to 10 g? The half-life of potassium-40 is 1.3 billion years.
1.3 billion years
2.6 billion years
3.9 billion years
5.2 billion years

Answers

Answer: b

Explanation: i toook the test

Answer: C.

Explanation:

3. Describe each one of the following types of fractures:
simple fracture
compound fracture
incomplete fracture
impact fracture
comminuted fracture​

Answers

Simple: The bone fracture does not break the skin
Compound: when the bone punctures the skin
Incomplete: the bone does not break completely
Impact: The bone fracture impacts another bone
Comminuted: The bone breaks into 3 or more pieces

Which situation would increase the fluidity of a

phospholipid bilayer?

A. decreasing the temperature

B. increasing the number of proteins

C. increasing the number of cholesterol molecules

D. increasing the number of unsaturated fatty acids

Answers

Answer:

C

Explanation:

Cholesterol molecules stay in between fatty acid tails preventing them from sticking together

The situation that would increase the fluidity of the phospholipid bilayer is increasing the number of cholesterol molecules. The correct option is C.

What is a phospholipid bilayer?

A phospholipid bilayer is a layer around a cell. The cell membrane is composed of a bilayer of phospholipids. It contains fatty acids and alcohol.  

Bilayers of phospholipids are essential parts of cell membranes. The lipid bilayer serves as a physical barrier to the entry and exit of molecules and ions from the cell. However, allowing the selective transit of specific substances into and out of cells is a crucial role of the cell membrane.

Cholesterol is present between fatty acid molecules and prevents them from sticking to each other.

Therefore, the correct option is C.  increasing the number of cholesterol molecules.

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Describe how the presence of lead in body cells could interfere with the
ability of enzymes to function. *

Answers

Answer:

Descreva como a presença de chumbo nas células do corpo pode interferir com o capacidade de funcionamento das enzimas. *

Explanation:

espero ter ajudado boa noite

All living things are made of one or more organs? True or false

Answers

Answer: True

Explanation:

All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms. ... Organs are collections of tissues grouped together performing a common function. Organs are present not only in animals but also in plants.

How does temperature affect the rate of a reaction?
A. temperature decreases, the kinetic energy of the particles increases and the number of collisions between particles increases
B. As temperature increases, the kinetic energy of the particles increases and the number of collisions between particles increases
C. As temperature increases, the kinetic energy of the particles decreases and the number of collisions between particles increases
D .As temperature increases, the kinetic energy of the particles decreases and the number of collisions between particles decreases

Answers

The answer is B because the kinetic energy increases so does the number of collisions between particles

Osmosis is a form of _________ that involves the movement of​

Answers

Answer:

Osmosis is a form of passive transport that involves the movement of water or other solvents through a semi-permeable membrane into an area of higher solute concentration.

For example:

Plant root hairs absorb water from the ground. The roots have a higher solute concentration than soil which is why water flows into the roots.

magine a white bug and a brown bug on a brown rock. Which bug do you think a bird would most likely try to catch? Explain your choice.

Answers

white

Explanation:

the white bug is lighter so the bird will most likely to go for it

Suppose you were interested in the effect of breastfeeding versus formula feeding on the composition of gut flora in newborns. As part of your experiment, stool samples from healthy babies in the study get plated on various agar media. You notice that greater numbers of colonies are recovered when samples are plated on blood agar compared to nutrient agar (NA). After some diligent subculturing, you isolate several bacterial species capable of slow growth on the blood but not on the NA. You correctly surmise that these organisms: ______________

a. are opportunistic blood pathogens.
b. have extensive and complex nutritional requirements not met by NA are inhibited by the ingredients in NA.
c. should be classified as beta-hemolytic.
d. grow because the blood agar suppresses the growth of faster-growing bacteria.

Answers

Answer:

vAurora

Explanation:

If antenna length in Mendaliens is controlled by a single gene and long is dominant to short and two Mendaliens with Long antenna have some offspring with short antenna, what is the genotype of the Mendalien parents

Answers

there are multiple possibilities but one of them is that both parents are heterozygous dominant (one capital and one lowercase letter)

Which of these is an advantage of factory farming?
O A. Less efficient operation than family farms
O B. More job opportunities than family farms
O C. Smaller profit margin than family farms
O D. More expensive products than family farms

Answers

Answer:

B

Explanation:

Answer is not A because this is not a benefit

Not C because it is also not a benefit

not D because it is not a benefit

B is the only benefit listed.

Which is the best hypothesis for the extinction of the dinosaurs at the end of the Cretaceous period?

A.
Mammals evolved and killed the dinosaurs.

B.
Humans destroyed all the dinosaurs.

C.
The climate changed and the dinosaurs could not adapt.

D.
The dinosaurs killed each other.

Answers

Answer:

extinction, the best-known being the non-avian dinosaurs. It also destroyed myriad other terrestrial organisms, ...

Explanation:

....

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