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djverab [1.8K]
3 years ago
9

The Bohr model of atoms shows a proton-rich nucleus surrounded by orbiting electrons.

Biology
2 answers:
romanna [79]3 years ago
7 0
A is the best answer and it’s correct
Anna71 [15]3 years ago
4 0
A is the answer dear.
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In sedimentary rock,younger fossils are found on top of older ones what is is this called
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Answer:

Superposition

Explanation:

Sedimentary rocks are deposited one on top of another. The youngest layers are found at the top of the sequence, and the oldest layers are found at the bottom.

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What are atoms? How are they like building blocks?​
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All cell membranes are primarily composed of _____________.
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During binary fission, a bacteria cell grows in size because DNA and other organelles are _____. exchanged transferred duplicate
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Binary fission is the process of a bacterial cell going from singular to double. Therefore the correct answer would be: "During binary fission, a bacteria cell grows in size because DNA and other organelles are duplicated."
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3 years ago
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A geochronological scale measured in Millions of Years Ago or M Y A. Mesozoic era: Triassic period, 250 to 201 MYA, first dinosa
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Answer:

<em><u>D. The first flowering plants were introduced toward the end of the Mesozoic era.</u></em>

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Explanation:

Following the Paleozoic Era, the Mesozoic Era or <em>Age of Conifers</em> began approximately 250 million years ago. This major geological era brought about the ancestors of many of the plant and animal groups still in existence today.

The Mesozoic era is marked by 3 divisions:

  1. the Triassic Period,
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  3. and the Cretaceous Period.

Animals and plants slowly recovered  after the mass extinction in the Permian-Triassic extinction that led to the eradication of most aquatic marine species. They evolved to exploit varying niches in their environment, leading to a boom in terrestrial animals. Over time the planet's increasingly warm climate, abundant in atmospheric oxygen and carbon dioxide, contributed to the growth of diverse megaflora, that rapidly dominated the planet's terrestrial biosphere.

By the end of the <em>Mesozoic Era</em>, in the Cretaceous period, flowering plants (angiosperms) largely replaced the dominant seed ferns of the <em>Triassic</em>, and the conifers, cycads and gymnosperms of the <em>Jurassic</em>.

<em>Varied dispersal  mechanisms in angiosperms co-evolved with the evolution of certain types of fauna. Plants used animal life, including herbivorous reptiles and early mammal-like species to disperse large seeds.</em>

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