Two students suggested that the wallflower cannot produce fruit unless pollination has taken place. Their
teacher showed them how to prevent bees reaching
the flowers by covering the flowers in a fine mesh bag,
and how to transfer pollen with a fine paintbrush.
a Describe how the students could carry out an
experiment to test their hypothesis
b Suggest how they could modify their experiment to
test whether self- or cross-pollination produced
more seeds in the wallflower
In your answer be sure to describe any controls which
they could include, and any steps they could take to
ensure that their results were valid

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.