Answer:
The correct statements would be
- Cyanobacteria allowed organisms that rely on oxygen to evolve.
- Cyanobacteria preceded the first photosynthetic organisms.
- Cyanobacteria produced excess oxygen.
Cyanobacteria, also termed as blue-green algae are the prokaryotes which are able to perform photosynthesis.
They were the major contributors of oxygen in the atmosphere and thus helped the organisms that rely on oxygen to evolve.
By the process of endosymbiosis, they lead to the origin of plants. The chloroplasts present in green plants is considered as the cyanobacteria living in the plant cell. It helps in photosynthesis and in return plants cell provides shelter to it.
It is believed that the oxygen released from early cyanobacteria reacted with dissolved iron ions to form iron oxide.
I think it might be uranium
hope this helps.
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Speed = wavelength x frequency determine the speed of a wave,
Part a)
kinetic energy of the hammer will be

here we know that
m = 4 kg
v = 6 m/s
now by the equation of kinetic energy we have


Part b)
for finding the force we will have

here we know that



now from above equation we have


now by Newton's II law we have


so it requires 720 N.
Waves carry energy through objects. mark me as brainlist.