The scientist konstantin mereschkowsky knew in the early 1900s that plants make their own food by using sunlight. he also saw tiny parts in plants called chloroplasts that do not appear in any animals. he hypothesized that chloroplasts are what plants make food. after many more observations of all types of plants and animals, scientists are convinced today that chloroplasts make food for plants. has the study of chloroplasts been scientific or pseudoscientific? a. scientific, because a hypothesis and observations were made and then a conclusion was drawn b. scientific, because scientists made a hypothesis and conclusion before making any observations c. pseudoscience, because a hypothesis was believed to be true before any observations were made d. pseudoscience, because beliefs in chloroplasts are based on subjective opinions

The correct option is A.
It can be seen from the question given above that the scientist Konstantin made an observation, he formulated an hypothesis and actually carried out an experiment which made him to conclude that plants make their own food using chloroplast. This is the same procedure that is used to carry out scientific investigation; this shows that the study of the chloroplast is a scientific one and not pseudo scientific.

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

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