Mammals first appeared during the _______ era.

Answers

Answer 1
Answer:
Mammals first appeared during the Mesozoic era.Hope I helped, good luck!'
Answer 2
Answer:

Answer:

B.) Mesozoic!

Explanation:


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When magma hardens in a volcano s pipe, the result will eventually be a landform called aa. batholith. b. dike. c. volcanic neck. d. sill.
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A limestone bed containing fossils that are 550 million years old is ____ a bed of sandstone containing fossils that are 400 million years old.a. younger than c. older than b. the same age as d. not related to
Type of limestone found in the caribbean

Molten rock under ground

Answers

Molten rock underground is commonly known as magma. Magma is a hot, semi-fluid or fluid rock material that exists beneath the Earth's surface.

What is molten rock underground

It is formed through the partial melting of rocks in the Earth's mantle due to high temperature and pressure. Magma can vary in composition, depending on the type of rocks that melt and the degree of melting.

When magma reaches the Earth's surface through volcanic eruptions, it is then referred to as lava. Lava can flow out of volcanoes, and as it cools and solidifies, it forms various volcanic landforms such as lava flows, volcanic domes, and volcanic islands.

Read more on molten rock here brainly.com/question/9835765

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Complete question

Molten rock under ground is called _____

Magma. Magma can be made of many different materials, and once it breaches the earth surface it is called lava. Lava is what comes out of volcanoes, magma is what is still underground

Which of the following is part of a rock formation that consists more or less of the same type of rock material?A. bed
B. fossil
C. event
D. stratum

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BED

The Glossopteridales are the fossils that occur on the most of the landmasses. They are the extinct group of seed plants. The rapid appearance of this one gives us more understanding about the Paleobiography, this is the study of animals and plants distribution through the years.
The appearance of Glossopteridales fossils also helped scientists to study so much about their species, that includes their seeds, leaves, branches and their oddly shaped roots. They grew at the beginning of the Permian and started to extinct at the end of the Permian period.

As a result of the health and social problems in Russia in the 1990s and 2000s, there has been _____.

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Since you provide no options,

as a result of the health and social problems in Russia in 1990s and 2000s Russia reformed their public healthcare systems.

In 1996,  the constitution of the Russian Federation  provides their citizens with free healthcare under mandatory medical insurance

a population decrease in Russia

The contract responsibilty system was

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It was a practice in china first adopted in agriculture in 1979

Nomadic livestock herding might be found here.

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normally in northwest china 

An unknown igneous rock has very small crystals. The rock _____.

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The answer would be: The rock cooled quickly.


These types of igneous rocks are called extrusive rocks. These are igneous rocks that cooled on the surface. They form only small crystals because they cool quickly at the surface. Intrusive rocks are its counterpart, they form bigger crystals because they form underground and slowly allowing time for bigger crystals to form.

cooled quickly, because lava cools and crystallizes rapidly