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Contact [7]
1 year ago
13

What system plays a vital role in the existence of the human species? What's the ans?

Biology
1 answer:
Naily [24]1 year ago
7 0

Answer:

The reproductive system.

Explanation:

Without the reproductive system, humans are not able to reproduce meaning the human species would go extinct. With the reproductive system, humans are able to create more humans, in this way humans do not go extinct.

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An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
podryga [215]

Answer:

the proton and the neutron

Explanation:

An atom is made up of subatomic particles; neutrons, protons and electrons. The protons are positively charged subatomic particles found in the nucleus with a mass equal to 1.6 \times 10^{-27} kg.  The electrons are negatively charged particles of an atom found in the orbital shells in constant motion. They have a mass equal to 9.1 \times 10^{-31} kg.  The neutrons are particles found in the nucleus that have no charge and have a mass equal to 1.6 \times 10^{-27} kg. therefore protons and neutrons are similar in mass.

5 0
3 years ago
Read 2 more answers
Periaqueductal gray neurons send descending axons into various regions of the medulla releasing serotonin.
Evgesh-ka [11]

Answer:

True

Explanation:

Periaqueductal gray matter is found in the middle portion of brain.  When this grey matter is stimulated it activates neurons that releases enkephalin. Enkephalin further direct the stimulation to the raphe nuclei  with in the brain stem that releases serotonin. In this process, the ascending and descending axons are released  from  

a) subcortical nuclei

b) spinal trigeminal nuclei  

c) the spinal cord

Hence, the given statement is true

5 0
2 years ago
In the beginning all the contents were grouped together as one giant landmass. What role did separation of them play in evolutio
Lena [83]
When the continents separated, organisms were forced to be placed in different locations with different environmental conditions. In order to survive in their new environment, over time, various flora and fauna developed various body mechanisms to cope up. This brought up the speciation of flora and fauna.
6 0
2 years ago
All chordates have _____ (at some point in their life cycle). feathers diaphragm fins pharyngeal pouches
IceJOKER [234]
<span>The correct answer is pharyngeal pouches.</span>

   <span>All chordates for at least some period of their life have pharyngeal pouches (pharyngeal slits). Those are the openings in the pharynx with the function in the filter-feeding. Pharyngeal slits are present during the embryonic stages of tetrapod development. They <span>develop into gill arches  (bony fish) and into the jaw and inner ear (terrestrial animals).</span></span>
5 0
2 years ago
What's the difference between non-living and dead things?
kobusy [5.1K]
Dead things were once living, such as a dead plant. Non-living things were never alive, like coal. 
5 0
2 years ago
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