1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Bingel [31]
2 years ago
11

A long time ago, farmers discovered that if they grow the same

Biology
1 answer:
levacccp [35]2 years ago
5 0

Answer:

Because they don't have fertilizer.

Explanation:

Well, if this was a long time ago, then farmers did not have fertilizer. So, there are bacteria on the roots of plants that convert nitrogen into a usable form. It's very important for growing, and when farmers harvest the crop, not much of the nitrogen is returned to the land, so it is not as fertile. Fertilizer is largely consisted of nitrogen, so that is why farmers use fertilizers today. But "a long time ago," farmers did not have fertilizer.

You might be interested in
Human blood types are characterized by the presence absence of surface markers known as a tigers on the surface of red blood cel
zalisa [80]

Answer:

characterized by presence or absence of antigens

the blood types are A, B, O, AB

Explanation:

There are two antigens and two antibodies that are mostly responsible for the ABO types.  The specific combination of these four components determines an individual's type in most cases. Erythrocytes and serum were related to the presence of antigens on these erythrocytes and antibodies in the serum. these antigens  are A and B, and depending upon which antigen the erythrocytes express, blood either belonged to blood group A or blood group B. A third blood group contained erythrocytes that reacted as if they lacked the properties of A and B, and this group was later called "O" blood group. The fourth blood group AB, was added to the ABO blood group system. These erythrocytes expressed both A and B antigens.

Blood group   Antigen present on RBC    Antibodies in serum    Genotype(s)

      A                        antigen A                             anti-B                     AA or AO

      B                        antigen B                             anti-A                     BB or BO

      AB              both A and B antigen                 none                         AB

      O                           none                           anti-A and anti-B           OO

4 0
3 years ago
Which of the following is a node that you would expect to find on the cladogram for animals?
spayn [35]

Answer:

B - Deuterostome development

7 0
3 years ago
Read 2 more answers
Why is humus important?
Sauron [17]

Answer:

D) It decreases water movement.

Explanation:

Humus is known as part of the soil formation. It is characterized by various qualities some of which include containing nutrients such as nitrogen. It is also characterized by its ability to retain water content or soil moisture. Humus is made from the decays of plants wastes such as leaves.

Hence, in this case, the correct answer is Humus is important because "It decreases water movement."

7 0
3 years ago
Read 2 more answers
About two-thirds of body fluid is found within living cells; this fluid is called the ________.
Savatey [412]
The sodium ion content of the extracellular fluid
6 0
3 years ago
Why is it important to follow strict safety procedures when handling a urine sample
xz_007 [3.2K]

Because you could easily contaminate the results of the urine if you don't follow exactly what the strict rules dictate This could be a very dangerous thing because if you contaminate the results, then other doctors would think that the patient has some disease that needs to be taken care of which in reality they do not. The patient could also have to go through things or waste money on things that they don't need to because there was something in the urine that wasn't supposed to be there which was added because they didn't follow the strict rules. Then the doctor who contaminated it could be sued for malpractice which is never a good thing.

7 0
3 years ago
Other questions:
  • Some insects have evolved the ability to pollinate only specific types of flowers. The process of two species evolving together
    15·2 answers
  • Which physical property would not be useful for finding the difference between baking soda and cornstarch?
    6·2 answers
  • Q: If a bowling ball has more mass, it also has more interia
    6·2 answers
  • What did Siddhartha's father most want his son to become?
    12·2 answers
  • Compared to the right ventricle, the left ventricle has all the following characteristics except that it
    15·1 answer
  • This food chain can be found in the coastal waters of Virginia which organisms in this food chain are herbivore
    13·1 answer
  • How do you think the high rates of HIV transmission in humans might be related to the length of time it takes for the virus to d
    5·1 answer
  • What movement of plates cause a earthquake
    6·2 answers
  • What are two ways you can
    15·1 answer
  • Please help
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!