Asteroid impact
Volcanic eruptions
Explanation:
Asteroid impact and volcanic eruptions are two common events that could lead to a mass extinction.
A mass extinction is an abrupt decrease in life on earth due some catastrophic event.
- The collision of a large bolide on the surface of the earth is a catastrophe in itself.
- The collision and its aftermath have destructive consequences on life.
- The force of the collision can reverberate in form of vibration throughout the earth.
- It can cause heating of the earth surface.
- Volcanic eruptions can become global phenomenon that upsets the earth balance.
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When RNA is transcribed from DNA ( Transcription) and leaves the nucleus, it is called mRNA. This message is “read” by ribosomes in groups of three nucleotides, called a codons
Answer:
<h2>Digestion in sponges is intracellular.
</h2><h2>Cnidarians carry out extracellular digestion
.</h2>
Explanation:
digestive process in cnidarians differ from sponges
1. i) sponges have intracellular digestive system.
ii). They feed on planktons by filtering water.
iii). Digestion takes place completely in choanocyte cells.
Cnidarians
1. i) Cnidarians are predators and feed on small fish, krill and many small species.
ii )All cnidarians are carnivores and have very simple body structures adapted as predators.
iii) Cnidarians carry out extracellular digestion. Enzymes break out the food into small particles. Cnidarians have an incomplete digestive system and have only one opening.
The answer is C DNA travels from the nucleus to the cyphoplasm
