A scientist looked at a sample of fresh blood under a microscope. She produced the following drawings of what she saw. Give two ways in which white blood cells destroy disease-causing micro-organisms

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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feral cats are estimated to eat tens of millions of native animals each night in australia