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emmasim [6.3K]
3 years ago
9

The three primary germ layers are called ectoderm, mesoderm, and endoderm. Once these three layers have formed, the developing t

rilaminar structure may be called a(n)_____________.
Biology
1 answer:
romanna [79]3 years ago
8 0

Answer:

Gastrula

Explanation:

A hollow shaped embryonic structure formed after two weeks of fertilization with three layers is known as gastrula.

The gastrula is formed from the repeated division of the single-layered structured called blastula which later forms three layers called ectoderm, endoderm and mesoderm.

These layers during the process of gastrulation from different organs of the multicellular organisms like the endoderm forms the liver, the ectoderm form the nervous system, the skeletal bone and many others.

Since gastrula structure contains three dermal layers therefore gastrula is the correct answer.

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The statements that describe steps taking place in the nitrogen cycle are

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Nitrogen cycle is biochemical process whereby nitrogen is converted to various chemical forms as it passes through the atmosphere, Marine and terrestrial ecosystems .

Nitrogen cycle undergoes four ( 4 ) important processes which are :  

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Hence we can conclude that The statements that describe steps taking place in the nitrogen cycle are :

Many biotic and abiotic factors play a role in recycling nitrogen and

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Learn more about Nitrogen cycle : brainly.com/question/1380063

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Given what we know, we can say that biology and neo-Darwinism both support the idea that natural selection explains how the environment selects organizations for survival or extinction.

<h3>Natural Selection. </h3>
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