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PSYCHO15rus [73]
2 years ago
10

What causes the differences in physical characteristics like hair color among people?

Biology
2 answers:
Mazyrski [523]2 years ago
7 0

Answer:

the two types of melalin ;

eumelalin and pheomelalin

Explanation:

fomenos2 years ago
3 0

Answer:

It has to do with pheomelanin and eumelanin

Explanation:

According to explorebiotech.com, "low concentrations of the eumelanin pigment will yield blonde hair, while high concentrations result in darker brown hair. People with natural red hair have much higher pheomelanin levels in their hair than people with more common hair colors like brown, blonde, and black." (Here's the link https://explorebiotech.com/science-behind-hair-colors/)

Hope this helps :)

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One of your fellow systematists has asked you to help her group organisms into a valid phylogenetic tree. At present, she has gr
kipiarov [429]

Answer and explanation:

Monophyletic species are the species whose lineage belongs to the common recent phylogenetic ancestor. As mentioned in the question, the girl has 3 species namely G, H, and K. Because there is no other criteria given, we assume that the closeness of alphabets would reflect the closeness of species. Thus, G and H are closer relative than K. Therefore, if she adds <u>I, and J species</u> in the list, all of them will be closer relatives and we can say that they are monophyletic now.

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3 years ago
Is a Heterotroph a araebacteria or a eubacteria
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3 years ago
¿Qué se puede agregar a un átomo para hacer que un electrón sin valencia en el átomo se convierta temporalmente en un electrón d
NNADVOKAT [17]

Energía.

Explicación:

Generalmente, los electrones giran continuamente en las capas de los átomos. Si estos electrones se encuentran en las capas más externas de un átomo, se denominan electrones de valencia.

Son necesarios para las reacciones químicas de un átomo en particular con otro, a través de sus pérdidas o compartidas.

En los átomos sin valencia, sus capas más externas no tienen electrones en sus capas más externas, tales átomos son estables.

Sin embargo, si se suministra cierta cantidad de energía a dicho átomo, el electrón gana energía y, por lo tanto, se excita.

Por lo tanto, se mueven de niveles de energía más bajos a niveles de energía más altos, y hacen que el átomo sin valencia se convierta en valencia temporalmente, a medida que se mueven hacia la capa más externa.

Answer:

Energy.

Explanation:

Generally, electrons revolves continuously in the shells of  atoms.if these electrons are located in the outer most shells of an atom,they are refereed to as the Valence electrons.

They are needed for chemical reactions of a particular atom with another,through their loses or sharing.

In Non -valence atoms their outermost shells do not have electrons at their outermost shells,such atoms are stable.

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They therefore move from lower energy levels to higher energy levels,and makes the non- valence atom becomes valence temporarily, as they move into the outermost shell.

5 0
2 years ago
populations of organisms that exhibit a high degree of variation have a greater chance for survival than populations of organism
N76 [4]
True because, more variation increases the species fitness, the ability to survive and reproduce. Allowing the organism to pass on their beneficial traits (advantageous traits), to their offspring.
7 0
3 years ago
What does nicotine in cigarettes smoke cause
Oxana [17]
Since nicotine is a form of a stimulant drug, in cigarette smoke it can cause addiction.
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