Antigens are found on cancer cells and the cells of transplanted organs, and anything that can trigger an immune response is called an antigen. Given these facts, what can trigger immune response among the following options: - harmful substances - Transplanted organs - desire - an area swollen with pus - death - pain - colors of the spectrum - Contaminated wounds
Transplanted organs

Erosion can cause a landslide, and landslides Seismic vibration is a common triggering mechanism for landslides. Given these facts, what can cause seismic vibrations, which are triggering mechanisms among the following options: - wind - erosion - vehicles - flooding - waves - rivers - energy - mines
erosion

Q: Coral reefs provide food and shelter to many ocean organisms, and oceans are important to life on Earth. Given these facts, what are coral reefs important to among the following options: - earth - stories - humans - ghosts - health - Man - moon - animals
A: earth

Question: Sound can be used for communication by animals, and snarls and barks are the sounds they make. Given these facts, some animals communicate through what among the following options: - chemical reaction - eating quietly - vibrating quickly - being silent - chemical changes - hormones - barks and snarls - chemical messengers
Answer: barks and snarls

*Question*
Gases from burning coal and oil dissolving in water in the atmosphere causes acid rain, and helpful Generalizations Vapors and gases are molecules. Given these facts, what from burning coal and oil dissolving in water in the atmosphere causes acid rain among the following options: - toxins - Pollution - excretion - chemicals - citric acid - bleach - vapors - water
**Answer**
vapors

*Question*
Melting is when solids are heated above their melting point, and ice is the solid form of water. Given these facts, when ice is what above its melting point that is melting. among the following options: - salinity - cooled - not - boiling - frozen - erosion - heated - an object
**Answer**
heated