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Liono4ka [1.6K]
3 years ago
5

An event in which large numbers of species disappear from the earth at the same time

Biology
1 answer:
Annette [7]3 years ago
7 0
This event is known as a mass extinction.

There has only been a small number of mass extinction events during the Earth's history but is accountable for the death of the dinosaurs as well as a vast array of organisms that once inhabited the lands and sea.

I hope this helps! I'm happy to help with any other questions you might have :)
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What part of the cell manufactures the ribosomal subunits
Lemur [1.5K]

When newly formed proteins leave the rough endoplasmic reticulum, they are transported to this organelle, where the proteins are sorted and packaged. Golgi apparatus. This part of the cell manufactures the ribosomal subunits.


Golgi apparatus


IF THAT DOESNT WORK THEN USE

Rough Endoplasmic Reticulum      



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6 0
3 years ago
Sequence the events that take place when a motor neuron's action potential triggers a muscle contraction.
Serhud [2]

Answer:

A,C,F,E,D,B

Explanation:

The is the sequence of  action potential transmission at  at the neuromuscular junction. Generally the arrival of action potential from the presynptic neuron caused influx of ca+ which causes migration and  the  release of the the acetycholine to the synaptic cleft.

The acetycholine binds with the receptors  on the saccolemma to causes opening of Na+ , its influx to causes depolarizarion  of the sacolemma. The depolarization of the latter spreads along the transverse tubules, This depolarization causes increases in the permeability of the sacorplasmic reticulum, with opening of ca+ channels and diffusion of Ca+ out of the  S. reticulum.

The Ca+ binds to troponin,and tropomyosin  exposed the myosin-binding sites on actin filament . The myosin head forms the cross bridges with the filament, and therefore the sacomere shortens leading causing muscle contraction.

3 0
3 years ago
Read 2 more answers
Which steroid hormone(s) would not be produced if you blocked the activity of p450scc?
natka813 [3]
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3 0
3 years ago
I need help on how to set up the y-axis which would be the number from questions 2&3​?
lapo4ka [179]

the y axis would just be the number or points he got

4 0
4 years ago
Review the following list and select either an "H" if the item is a hazard, a "B" if it's a benefit, or "HB" if it can be both a
vampirchik [111]
Pyroclastic flows,lava flows and lahars are hazardous.                                      Geothermal energy is beneficial.   
Volcanic ash and volcanic materials can be both hazardous and beneficial.
Hope this helps you!

8 0
4 years ago
Read 2 more answers
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