Task:2 Directions: Use the word bank below to complete the following sentences.

Antibody Antigens Illness/Death Immune Pathogen White Blood Cells

1. The system identifies and defends the body against pathogens.

2. If an organism fails to maintain homeostasis, it will most likely cause
3. Microbes that enter the body, causing disease, are known as
4. Certain microbes can cause immune responses in the human body because their cell membranes contain , which serve as identification tags.
5. are responsible for attacking microbes that enter the body.
6. are specifically shaped proteins made by white blood cells.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.