In a clade, mammalian has the three descendents: monotreme, marsupials, and eutheria. what will these three descendants together be called?

twin groups
nodes
sister groups

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Select the correct answer from each drop-down menu proteins are

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