Which is proof that in any synthesis reaction, a chemical change has occurred

Aseries of connections of food chain in an ecosystem is called a what

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

Which step is not included in the step approach to calculating the greatest common divisor?