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
miss Akunina [59]
4 years ago
15

The four essential elements for life are _______. a.carbon, hydrogen, oxygen and nitrogen b. carbon, hydrogen, oxygen and sulfur

c. carbon, nitrogen, oxygen and sulfur d. iron, nitrogen, oxygen and magnesium
Biology
2 answers:
umka21 [38]4 years ago
7 0
Answer is A to all my homies out derrr
Dmitrij [34]4 years ago
4 0
The correct answer is "A. carbon, hydrogen, oxygen and nitrogen".



Scientists believe that out of the 116 known elements, only 25 are used by mammals (and therefore by humans). Out of the 25 elements that are believed by scientists to support human life, only four of these elements - carbon, oxygen, hydrogen, and nitrogen - make up about 96% of the human body and are found in the basic structure of all biochemical molecules within the human body. Because of this, carbon, hydrogen, oxygen, and nitrogen are considered "the four essential elements" supporting human life. However, it is also important to keep in mind that although many of the other 25 elements present in the human body are required in only small amounts, they play an important role in keeping the body functioning correctly, as well.
You might be interested in
A__________
densk [106]

Answer:

A census is a count of the population in particular areas.

Explanation:

4 0
3 years ago
Read 2 more answers
If you wanted to see a cell wall, where could you look?.
tatyana61 [14]

Answer:

A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.

Explanation:

A cell wall is a rigid, semi-permeable protective layer in some cell types. This outer covering is positioned next to the cell membrane (plasma membrane) in most plant cells, fungi, bacteria, algae, and some archaea.

3 0
2 years ago
Read 2 more answers
Which two hypotheses can be supported with quantitative data?
Katena32 [7]
The answer would be A and E

(I explained on the other one)
4 0
4 years ago
Which structure in the cell shown in Figure 7–2 above stores materials, such as water, salts, proteins, and carbohydrates?
RideAnS [48]

The answer is C. These structures are vacuoles and are found in plants cell (you can tell it’s a plant cell because of the outer cell wall in the picture). Vacuoles have a variety of other functions storage of waste products, maintain turgor pressure  for plants support.

5 0
4 years ago
Read 2 more answers
Which process is a squeezing motion of the circular layer of smooth muscle in the small intestine?
Over [174]

Segmentation is a squeezing motion of the circular layer of smooth muscle in the small intestine.

<h3>What is segmentation in the small intestine?</h3>

Segmentation, which mostly affects the small intestine, is made up of localized contractions of the Gastro-Intestinal tract's circular muscle. These contractions separate out little portions of the intestine, allowing their contents to move back and forth while being continuously divided, broken up, and mixed.

Our intestines' circular muscles contract during segmentation to churn food back and forth, rather like a washing machine. This churning helps break down food into tiny bits for digestion by allowing it to mix with gastric secretions in the intestines. By bringing chyme into contact with the intestinal walls during segmentation, the technique also helps to increase absorption.

Learn more about segmentation here:

brainly.com/question/2133778

#SPJ4

4 0
1 year ago
Other questions:
  • What is the most important goal of nursing care for a client who is in shock?
    15·1 answer
  • El agua es ácido,base o neutro?
    5·1 answer
  • What do the c cells of a thyroid gland produce
    15·1 answer
  • Which of the following are true of a bacterial cell but not an animal
    14·1 answer
  • What is (are) the role(s) of complement proteins in the immune response?
    13·1 answer
  • Which process begins the formation of sedimentary rock?
    13·1 answer
  • Interesting biology project topic ​
    15·1 answer
  • A student takes a black and white picture of a stone statue in a park. He compares that picture with one of the statue when it w
    13·1 answer
  • What causes water to maintain its temperature whether it is hot or cold?
    13·2 answers
  • An organ or tissue may be better able to resist damage from hypoperfusion if the:_________
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!