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Andreas93 [3]
3 years ago
7

In a organism, the brain directs the body how to respond to stimuli from the environment. in a cell, this function is performed

by the-
Biology
1 answer:
prohojiy [21]3 years ago
6 0

Answer:

Nucleus

Explanation:

In eukaryotic cells, the nucleus is a membrane-bound structure that contains the genetic material, which is expressed in response to cell stimuli (i.e., environmental stimuli). This genetic material consists of genes that are expressed in response to cell signaling events. For example, the transcription factors that are found in the cytoplasm are activated after receiving a signal from receptors localized in the cell membrane, when these membrane receptors bind to specific signaling molecules. Subsequently, these transcription factors are translocated into the nucleus to interact with DNA promoter regions in order to activate the expression (transcription) of target genes capable of responding to an environmental stimulus.

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Answer:

Ammonites, , Brachiopod, Grapolithina, Trilobites and Nanofossils are examples of index fossils

Explanation:

Ammonites were common during the Mesozoic Era (245 to 65 mya), but were not found after the Cretaceous period. They went extinct during the K-T extinction (65 mya)

Brachiopods which are mollusk-like marine animals appeared during the Cambrian (540 to 500 mya). Some types of them still survive

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Trilobites were common during the Paleozoic Era (540 to 245 mya); about half of the Paleozoic fossils are Trilobites. Trilobites evolved at the beginning of the Paleozoic Era and went extinct somewhere in the late Permian period which was 248 million years ago

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3 years ago
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allsm [11]

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6 0
2 years ago
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