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Anestetic [448]
2 years ago
8

Why is the horseshoe crab an example of a living fossil?

Biology
2 answers:
grigory [225]2 years ago
8 0

Horseshoe crab is an example of living fossil because there are fossil extinct of ancestors of horseshoe crabs, and the species still alive today. Horseshoe crab has been around for so long; it has survived mass extinction and it is still around.  

<h2>Further Explanation</h2>

Horseshoe crab is considered living fossils because they have existed unchanged for about 445 million years. They are usually not crab; they are not closely related to lobsters or crab. Horseshoe crab is very closely related to spiders and other arachnids.

Generally, there are four species of horseshoe crab that is living today but one out of the species, called Limulus polyphemus can be found in North America. It is found near the Atlantic and gulf coast: from Maine to Mexico.

Horseshoe crab looks is almost the same with their ancient relatives despite the fact that they have been around for so long.  Their body structure is tank-like, which is made of:

  • A spike tail also known as the telson (used for digging and very fragile)
  • A front shell, called the prosoma (this is the large section of the horseshoe crab)
  • A back shell, called the opisthosoma (horseshoe crab abdomen, and it is the center section of the shell)

LEARN MORE:

  • horseshoe crabs brainly.com/question/9888545
  • The horseshoe crab brainly.com/question/8989379
  • class of the horseshoe crab brainly.com/question/10117765

KEYWORDS:

  • horseshoe crab
  • telson
  • prosoma
  • opisthosoma
  • species
  • crab
Readme [11.4K]2 years ago
3 0

Answer:

A. There are fossils of extinct ancestors of horseshoe crabs and the species is still alive today.

Explanation:

C and D have more to do with how it can be a fossil. It is a living fossil because its ancestors have been found in fossils, yet it continues to live today.

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The energy trapped in fossil fuels come from energy plants converted during photosynthesis. This trapped energy is
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Answer:

The energy trapped in fossil fuels came from the energy plants converted during photosynthesis. This trapped energy is. chemical ... are using energy for

Explanation:

6 0
2 years ago
A mutation is made once in every nucleotides copies
dimaraw [331]

Explanation:

A mutation is made once in every <u>10 billion</u> nucleotides copied.

During the process of cell division, spontaneous changes within the genome can arise. These mutations are errors occur when copies of the DNA within the cell are made; mutations may range from small changes called single nucleotide polymorphisms, to large scale deletions, and additions which span multiple genes.

 

Further Explanation:

 

During reproduction other events, such as crossing over during mitosis and meiosis, mutations lead to increases in genetic variation. This variation refers to the genetic characteristics present within a species. Mutations may be either beneficial or deleterious; they are maintained within cells, as they form new traits called alleles. Beneficial mutations may confer traits that increase the fitness of a species, along with ensuring survival by conferring a protective advantage- these phenotypic differences between organisms are called adaptations.

 

Sequences of DNA make up genes which can have different forms called alleles. DNA, which makes up the genotype, is transcribed into mRNA and later translated into amino acids which are linked together by rRNA to form proteins which make up the phenotype of an organism. Mutations in DNA sequences affect the corresponding mRNA and thus the protein encoded.

 

Learn more about mutations at brainly.com/question/4602376

Learn more about DNA and RNA at brainly.com/question/2416343?source=aid8411316

#LearnWithBrainly

5 0
2 years ago
In certain bacteria, an oval shape (O) is dominant over round (o) and thick cell walls (T) are dominant over thin (t). Draw on a
seropon [69]

Answer:

Consider the heterozygous oval, thick cell walled bacteria to have the alleles OoTT and the thin cell walled bacteria to have alleles oott. Results will be 50% oval, thick walled bacteria and 50% round, thick walled bacteria. This will be the F1 progeny.

When the oval, thick walled bacteria from the F1 progeny is cross bred with round, thick walled bacteria then 25 percent of the bacteria will be heterozygous oval, thick walled. 25 percent will be heterozygous oval and heterozygous thick walled. 25 percent will be round and thick walled. 25 percent will be round and thin walled.

6 0
2 years ago
a species of rodent can either have brown fur or white fur. Brown fur is recessive and white fur is dominant. what would cause t
Shalnov [3]

The mutation as the Hardy- Weinberg equation assumes that there would be no evolutionary pressures such as mutations. Hardy- Weinberg represents an 'ideal' where the allele frequencies would remain constant

The rodents mutate the new grey allele.
8 0
2 years ago
Read 2 more answers
A fly has two alleles for the color of its eyes. The green allele is recessive, and is represented by q. The blue allele is domi
murzikaleks [220]

Answer:

p = 0.34

Explanation:

The green allele is recessive, meaning two copies of q (qq) are required to be green. Conversely, animals that are either pp or pq will be blue.

If 44 organisms are green, that means 44 are qq.

For genotype frequencies, the equation is:

homozygous dominant genotype + heterozygous + homozygous recessive = 100%

Which is denoted as

p² + 2pq + q² = 1

We know that q² = 44/100 = 0.44

To work out q, we can do \sqrt{0.44} = 0.66

For allele frequencies, the total must add up to 100%, so

p + q =1

We know that q= 0.66

So p = 0.34, because 0.66 + 0.34 = 1

7 0
2 years ago
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