In an ecosystem, the more living requirements that two different species have in common, the more intense will be their А parasitism.
B energy requirements.
С competition.
D ecological succession.​

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?

The first amino acid of a new polypeptide chain is

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium