DNA is made up of pairs of nitrogenous bases. Which of the following nitrogenous bases is paired correctly?
A. Adenine-guanine
B. Guanine-cytosine
O c. Cytosine-thymine
O D. Guanine-guanine

Monitor and apply fix up strategies

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

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