False. Strontium 90 has a half life of only 30 years, and as millions of years pass, about the time fossils have been around, most if not all of any strontium would have decayed.
Nails are made of iron because, iron is strong and sturdy; although nail rust when it undergoes oxidation when expose to water but it is not explosive.
Barium and phosphorus are not suitable for nail making because of their properties.
Barium is an element which reacts with virtually all non metals, forming poisonous products which are dangerous to health and to the environment. It also reacts explosively with water.
Phosphorus is not found in its pure form in nature, it conducts electricity and it is combustible in nature.<span />
Answer:
To conclude, you cannot prove a hypothesis because you can never generalise the results to the whole population and foresee the results will always be the same in the future. You can however, reject the null hypothesis consistently, through statistical hypothesis testing so that the theory becomes highly likely to be true, but not proven.
Explanation:
Answer:
The correct answer is option B, that is, cerebral palsy.
Explanation:
An array of disorders, which influence the tendency of an individual to move and maintain posture and balance is termed as cerebral palsy. The condition is most commonly witnessed in childhood and is a motor disability associated with the poor functioning of the brain. The condition results in muscle weakness as part of the brain that helps in controlling muscles get affected.
The signs and symptoms of cerebral palsy vary, for example, individuals suffering from the extreme form of cerebral palsy would need the assistance of certain equipment in order to move. On the other hand, individual suffering from mild cerebral palsy can walk to a certain extent, however, might also need help in order to do that.
Cerebral palsy can result in many conditions based on the part of the brain getting affected like stiff muscles, poor balance and coordination, and uncontrollable movements. Thus, in the given case, Sammy is suffering from cerebral palsy.
Answer:
All of the activities are directed by plant hormone
