Worksheet 5 A. Fill in the blanks. 1. The ability of an organism to fight against infections and harmful substances is called 2. The cells produce antibodies in response to an antigen 3. Some common examples of are dust, mould, pollen, insect stings and nurs and get swollen 4. During an asthma attack, the B. Name the four tests that are used to check if someone is allergic to a substance.

Why do we perceive objects as retaining their brightness under different lighting levels?

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area