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AnnZ [28]
3 years ago
8

What is a mass extinction?​

Biology
2 answers:
rjkz [21]3 years ago
8 0

Answer:

A mass extinctions is a rapid decrease in the biodiversity on Earth.

Explanation:

For example, the Dinosaurs.

Korvikt [17]3 years ago
6 0

Answer:

The extinction of a large number of species within a relatively short period of geological time.

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Match the human activity and how it increases the greenhouse affect
laiz [17]

Answer:

1. primary cause of human-created carbon emissions = burning fossil fuels

2. destroys natural carbon sinks leading to more carbon dioxide in the air = deforestation

3. emits methane from decomposing matter = waste disposal in landfills

Explanation:

1. "Fossil fuels" are <em>nonrenewable resources</em> that are considered essential for the operation of many factories and industries. <em>Burning them accounts for most of the carbon emissions on Earth</em>, and this leads to<em> "global warming."</em>

2. "Forests" are considered "carbon sinks" because they have a role of <u><em>absorbing the carbon dioxide in the atmosphere</em></u>. Cutting down the trees (deforestation) makes forests barren. It then leads to more carbon dioxide in the air.

3.<em> Waste disposals in landfills contribute to the amount of methane that is released into the atmosphere.</em> Methane is considered a <em><u>potent greenhouse gas</u></em> that affects people's health.

7 0
3 years ago
P680 is said to be the strongest biological oxidizing agent. Given its function, why is this necessary
mylen [45]

Answer:

The correct answer is - it obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has

Explanation:

P680 known as which contains a reaction center in photosystem two, it is a very strong oxidizing agent that catalyzes the transfer of electrons from H2O to a bound quinone, with the production of O2.

To have a stronger attraction for electrons than oxygen has, P680 gets electrons from the O2 atom in a water molecule.

8 0
3 years ago
The rhythmic bursts of brain activity that occur during nrem -2 sleep are called
eduard
Should be SLEEP SPINDLES
5 0
3 years ago
3 characteristics of sponges
zaharov [31]
They are multicellular, heterotrophic, they have no respiratory organs, and their digestion is intracellular!
4 0
3 years ago
Read 2 more answers
List in the order they occur in during the development of red blood cells.
Serhud [2]

Stem cells arise from the inner mass of the cell

Signalling factors trigger differentiation in stem cells

Genes that lead to the production of undifferentiated blood cells are activated

Signalling factors cause undifferentiated blood cells to produce red blood cells

Explanation:

Red blood cells are formed in the bone marrow. The precursor to the RBC is stem cell which is undifferentiated and pluripotent. The stem cell gets differentiated to form immature RBCs. Immature RBC then gets divided and becomes mature. Stem cell giving rise to RBC is called Haemoctytoblast. The process of erythropoiesis takes 2 days to form new  red blood cells

7 0
3 years ago
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