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never [62]
2 years ago
12

Sarah and Sue were trying to identify minerals in science class. They initially divided all of the samples based on whether or n

ot they had a opaque and reflective luster. Donald questioned this tactic: "Why are you doing that?" Sarah told him that it helped to classify minerals as A) hard or soft. B) made-man or natural. C) shiny or dull. D) silicates or carbonates.
Biology
1 answer:
tangare [24]2 years ago
6 0
I think it might be C)shiny or dull
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The key to the evolution of altruism is that a. recipients have to be more likely to carry the altruistic allele than nonrecipie
cupoosta [38]

Answer:

The correct answer is b. actors have to be more likely to carry the altruistic allele than non actors.

Explanation:

Altruism is the behavior by an organism that benefits other organisms by costing its own fitness. The actor is the individual who is doing altruism and the recipient is the individual who is getting benefited by the actor's altruism.

An example of altruistic behavior can be seen in animal kingdom easily. Vampire bats give blood to those members of the community who were not able to go for search for blood show altruistic behavior.

Actors have altruistic genes that suggest them to behave altruistically. Non-actors may not contain alleles of altruism but the recipient might have altruistic alleles.

Hamilton's rule says that natural selection will favor the altruistic allele when rb > c.

where r = coefficient of relatedness between donor and recipient

          b = benefit received by recipient and

          c = cost paid by altruist.

Therefore, the correct answer is b.

6 0
2 years ago
Why were Archaea and Bacteria grouped together by biologists until recently?
Norma-Jean [14]
Archaea and Bacteria were grouped together because they were both Prokaryotes since they had no nucleus. Scientists then realized they were different because archaea can live in extreme environments, and bacteria can't.

hopefully my answer helps u 
6 0
2 years ago
Read 2 more answers
Domestic horses have a greater diversity of coat colors than that of wild horses. The process that led to a greater diversity of
victus00 [196]

Answer:

Option A

Explanation:

In this case, there are two varieties of horses: Domestic horses that are raised and bred by humans and Wild horses that lives in the wild. The issue of varieties in coat colour of domestic horses can be explained as what occured by selective breeding, also known as artificial selection which is a technique by which humans develop new offsprings with desirable and suitable characteristics. These breeders select two parents that possess beneficial phenotypic traits to mate, producing offsprings with those desired traits such as strength and also for coat colour as stated.

3 0
2 years ago
When voltage-gated sodium ion channels are inactivated, the neuron is _________________. in the absolute refractory period below
Ymorist [56]

Answer:

depolarizing

Explanation:

According to my research on studies by different medical professionals, I can say that based on the information provided within the question the neuron is depolarizing. This is what happens when voltage-gated sodium ion channels are inactivated causing an increas in the neuron's membrane conductance for sodium ions.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

5 0
2 years ago
he birds shown above have beaks with three different shapes and sizes.these genetic variations in the black each appeared initia
faust18 [17]

Answer:

mutations

Explanation:

5 0
2 years ago
Read 2 more answers
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