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
Mashcka [7]
3 years ago
10

The four essential elements for life are

Biology
2 answers:
sertanlavr [38]3 years ago
7 0
The answer is a
Hope this helped

g100num [7]3 years ago
3 0
<span>
A. carbon, hydrogen, oxygen and nitrogen
These four elements make up almost 96% of the human body.

Hope this helps!</span>
You might be interested in
If a pharmaceutical company decides to move all of its labs from suburban communities because of complaints, and relocates them
Vanyuwa [196]

Answer: Environmental racism

Explanation:

Environmental racism is the process whereby, communities with poorer people and also has no political backup are been expose or experience unjust and disproportionately heavy exposure of poor and toxic chemicals, contaminated air and water, unsafe workplaces, and other environmental hazrd. Environmental racism is highly associated with factors that link poverty to poor health, including inadequate access to medical and preventive care, lack of safe play spaces for children, lack of access to healthful foods, absence of good jobs, crime, and violence.

8 0
3 years ago
What is the key activating signal in the TNF receptor signaling pathway that occurs downstream of TNF-alpha binding to the extra
Olenka [21]

Answer:

TNF-alpha is expressed as a homotrimer that exerts its activities through binding to two types of receptors: TNFR1 and TNFR2, which are transmembrane glycoproteins characterized by having an extracellular domain with 4 cysteine-rich domains (CRD 1-4) , each with 3 cysteinecysteine disulfide bonds.

Explanation:

TNF-alpha (Tumor Necrosis Factor), which has the characteristic of being a paracrine signaling ligand, is a pleiotropic cytokine that functions as a mediator of immune regulation, the inflammatory response and apoptosis in some cell types. Receptors in this family are involved, with some exceptions, in juxtacrine signaling; that is, both the ligand and the receptor are membrane proteins with extracellular domains through which signaling is established. The cellular responses promoted by TNF are initiated by its interaction with two different types of cell receptors, the type I receptor (55 kDa) and the type II receptor (75 kDa). Both types of receptors are part of the TNF receptor family, members of which include Fas antigen (apoptosis inducer, also called Apo-1 or CD95), CD27 (T-cell activation antigen), CD30 (lymphoma marker Hodgkin) and CD40 (B-cell antigen), which share the characteristic of cysteine-rich sequences in their extracellular domains. This family of cytokines generate cellular responses that include differentiation, proliferation, activation of NFκB and cell death, promoting the aggregation of receptor monomers, that is, they have a transmembrane domain that participates in the solubilization of the receptor and a domain of intracellular death that is involved in signal transduction. The binding of TNF to TNF-R1 induces a signaling cascade through its intracellular death domain, which subsequently leads to the activation of complex I (or inflammatory) of NFkB and proceeds to the transcription of anti-apoptotic genes, pro- inflammatory diseases and apoptosis complex II (caspases).

5 0
3 years ago
Which body system is responsible for motion in humans?
IRINA_888 [86]

Answer:

<h2>Muscular System.... off course</h2>

4 0
3 years ago
Read 2 more answers
Recombination is the primary source of genetic variation for
elena-14-01-66 [18.8K]
Natural selection<span> acts upon two major sources of genetic variation: </span>mutations<span> and</span>recombination<span> of </span>genes<span> through sexual </span>reproduction<span>. Most </span>mutations<span> do not affect the reproductive fitness of individuals -- some may be beneficial, some may be harmful, and </span>many<span> may be neutral. </span>Mutation rates<span> per gene are generally low</span>
7 0
3 years ago
Xylem transports sap upwards only whereas phloem transports food in both directions.
Ierofanga [76]

Answer:

Hello!!! Princess Sakura here ^^

Explanation:

True because the xylem transports water from the roots to the rest of the plant's body above ground and can only move up, whereas the phloem transports organic compounds both up and down the plant.

5 0
3 years ago
Other questions:
  • A force can exist between two charged particles or objects even if they're as small as subatomic particles. Between which of the
    10·2 answers
  • Who used to collect mosquitos for Roland Ross?
    11·1 answer
  • Adult male humans generally have deeper voices than do adult female humans. True or False
    6·2 answers
  • What are two types of asexual reproduction
    9·1 answer
  • Will give brainlist if u help
    13·1 answer
  • According to piaget, the most obvious change during the preoperational stage is the increase in
    14·1 answer
  • What type of storm is shown in the graph
    5·1 answer
  • How many nucleotides are in a codon?
    12·2 answers
  • Which of the following is composed of more than two hundred billion stars, including the sun? (1 point)
    8·1 answer
  • How is the energy produced by respiration stored? (Googled answers will be reported) (actual answers please)
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!