The stem of a plant must elevate the flowers, fruits and leaves of the plant so that the plant can receive enough sunlight to undergo photosynthesis. The cells in the stem of a plant often have thicker cell walls than the other parts of the plant in order to A. Allow more light to penetrate through the stem B. Secrete water and oxygen through the stem C. Provide support and strength to the stem D. Increase gas exchange in the stem

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

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.