Nearly all ecosystems need energy from to exist.

The body is protected against harmful flu viruses by

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.