In which type of rock would fossils of organisms a and b most likely be found?

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

Does anyone know what a poms statement is for biology? i don't know what it is and i have an assignment on it tomorrow, will award the best answer a brainliest!