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Travka [436]
3 years ago
12

Which of the following embryonic materials is matched with a correct post-natal (after birth) derivative? (Chose the most correc

t answer.)
a. Mesoderm, skin
b. Neural crest peripheral nervous system
c. Endoderm, kidneys+ gonads
d. Ectoderm, most, but not all of skeleton
e. Mesoderm, skeleton
Biology
1 answer:
Vlad [161]3 years ago
8 0

Answer: Option B.

Neural crest and peripheral nervous system.

Explanation:

Neural crest are bilateral paired cells of the neural tube that arise from the ectoderm layer of the embryo. Thesescells move to different part of the body and differentiate into various cell types like melanocytes,cartilage and bone, smooth muscle, craniofacial, neurons, gangalia e.t.c. The neural crest running through neural tube develop into peripheral nervous system after birth. Peripheral nervous system consist of neurons and gangalia outside the nervous system The peripheral nervous system connect the central nervous system to organs, skin and limbs.

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one gene in a population of snails determines whether they are poisonous. being poisonous (P) is dominant over not being poisono
Harlamova29_29 [7]

Answer:

F (pp) = 0.04

F (Pp) = 0.32

F (PP) = 0.64

Explanation:

Studying population genetics, we used the Hardy-Weinberg equilibrium model. In the case of snails, the H-W principle predicts that the total number of cases in the population should follow the following equation: PP + 2.Pp + pp = 200.

If a population has 200 snails and 8 are affected by a recessive condition, we have 4% affected, or 0.04.

This means that 0.04 corresponds to p², and p corresponds to 0.2.

Therefore, P is equal to 0.8 because p + P = 1.

Knowing the allele frequencies, we go to the frequency of the genotypes.

F (pp) = p² = 0.04 = 8 snails

F (Pp) = 2.Pp = 0.32 = 64 snails

F (PP) = P² = 0.64 = 128 snails

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3 years ago
When did people begin to notice that coastlines if continents fit together like a puzzle
pashok25 [27]

Answer:

B. When Alfred Wegener propose the idea of continental drift

Explanation:

The first true explanation came from Alfred Wegener, who proposed the Plate Tectonic Theory. This theory stated, in a nutshell, that the continents different pieces that collided together at faults.

Technically, explorers found out this way back. If you consider this the answer choice, then C is your best answer.

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Answer:

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Ants are the biggest example of eusocial insects. Other than ants, bees, wasps and termites show eusocial behavior. This behavior helps members of a team to perform equally.


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