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yarga [219]
3 years ago
9

The largest contributor to global greenhouse gas emissions is?

Biology
1 answer:
worty [1.4K]3 years ago
6 0
Human activities in the united states such as burning fossil fuels for electricity, heat, and certain transportation.

hope this helps :)
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Which of the following are associated with a rock's chemical composition? Select all that apply.
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B. Crystalline structure

C. Types of chemical elements

And

D. Amounts of chemical elements
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What could a scientist do to determine what era the Eocene Period belongs to on the geologic time scale?
Burka [1]

Answer:

Option B) study information related to the Cenozoic era

Explanation:

The complete question is

Scientists discovered that the Eocene time period existed in Earths history around 34 MYA. What do they need to do to determine what time period Eocene belongs to on the geologic time scale?

A) learn what happened during Precambrian time

B) study information related to the Cenozoic era

C) view the timing of events in the Mesozoic era

D) research events that happened during the Paleozoic era

Solution -

The period of Eocene belong to the Cenozoic era. The Cenozoic era is divided into three periods-  

a) The Paleogene – Existed between 65.5 to 23.03 million years ago

b) The Neogene - Existed between 23.03 to 2.6 million years ago

c) The Quaternary – Started some 2.6 million years ago and is continuing till present

The Paleogene is subdivided into three epochs –  

A) The Paleocene – existed between 65.5 to 55.8 million years ago

B) The Eocene – existed between 55.8 to 33.9 million years ago and  

C) The Oligocene – existed between 33.9 to 23.03 million years ago

Hence, studying about Cenozoic era will give information about the Eocene epoch

Hence, option B is correct

5 0
3 years ago
A scientist is studying a cell and can clearly see that it has ribosomes and mitochondria. Which statement best describes how th
yuradex [85]

Answer: The cell is eukaryotic because it contains mitochondria

Explanation: Because I said so but really this is the answer

7 0
3 years ago
In neuroscience, depolarization is an "all or nothing" response; what does that
Tom [10]

Answer:

The correct answer is - The neuron's intracellular charge must get more positive to meet a certain  thresh hold in order to depolarize. If the neuron does not hit that threshold, then the  neuron will not fire

Explanation:

In neuroscience, the depolarization of neurons shows the all or none law which is also called as all or nothing response. It states that all action potentials have the same size and the potential or strength of a nerve cell does not depend on the stimulus strength as all are the same size.

If a stimulus reaches a particular threshold cell or fiber will fire so either it will fire or not cross the threshold this is all or nothing response or law and depolarization is an example of it.

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3 years ago
Biology -
creativ13 [48]
C) DNA or protein sequences of shared genes.
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3 years ago
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