Aplant requires water to grow, and plants wither and die for lack of rain. Given these facts, vegetation will wither and die if it doesn't get enough what among the following options: - rain - radiation - oxygen - rocks - energy - water - dark - Energy.
water

The number of rings in a tree trunk can be used to estimate the age of the tree, and dendrochronologist: A person who studies tree ring growth. Given these facts, dendrochronologists do what with regards to tree age among the following options: - lie about age - support - observe it - estimate age - begin age - focusing a lens - reinforce age - genetic diversity
estimate age

Q: The gravitational pull of the Moon on Earth 's oceans causes the tides, and tides create current. Given these facts, if the moon was not present, what would happen to ocean currents among the following options: - erosion - Movement - decrease - summer end - imbalanced - flooding - watershred - rivers
A: decrease

Question: Algae have varied life cycles, and diatomes are a type of single celled algae. Given these facts, what have varied life cycles among the following options: - insects - h2o - bacteria - diatomes - mammals - days - gravity - Most plants
Answer: diatomes

*Question*
Antigens are found on cancer cells and the cells of transplanted organs, and antibodies immobilize and destroy their specific antigens. Given these facts, what can destroy cancer cells among the following options: - massive damage - Heart monitor - antibodies - rays or beams - belt - cancer - Pollution - adding heat
**Answer**
antibodies

(Q).
Rest has a positive impact on a health, and relaxation is a prerequisite to rest and good sleep. Given these facts, relaxation is a prerequisite to that which has a what impact on health among the following options: - terrible - survive - mild - positive - negligible - negative - sweating - exercise
(A).
positive