How many neutrons does element x have if its atomic number is 55 and its mass number is neutrons

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Match the description of each organism to the appropriate category