Answer:
If the person is young, bad posture can result in tight muscles which can cause pain within hours and OVER TIME (like months or YEARS) it could cause your spinal column to hyperextend and cause disk herniations which can be painful. So if you can only pick one answer, I would pick A, Poor posture can result in tight muscles. Think about when you get a sore neck from texting for too long. It's from straining your neck muscles to support the weight of you head in an unnatural (hunched over) position, AKA poor posture. But if you can pick more than one answer than I would go for A and B, because older people develop chronic pain and spinal arthritis (osteoarthritis) from everyday wear and tear on the spine from poor posture.
Explanation: Some tests let you choose more than one answer, I'm giving you the first answer to go for (Answer A) and a second one, (Answer B) if the test is saying "choose all correct answers."
If someone says do 5 reps of 20 push-ups yo do 20 push-ups then take a little break and do that 5 times
The oxygen in the upper atmosphere combine to form ozone layer (o3) that allows to colonize surface water.
Explanation:
The fossil stomatolites are formed at about 3.0 ga laminated bacteria. they form the sediments to fall into a thin film of bacteria, these bacteria binds with the sediment and grows through it.
Cynobacteria uses water, CO2 and sunlight to create their own food and produce oxygen as a by product. The significance of stromatolites is that they are earliest fossil evidence life on earth.
They were first organism to photosynthesis and produce oxygen.
