(Question)
You are presented with the question "What is one thing that rings can tell you?" and the following answer choices: - chemical changes - encoded information - coded genes - age of a woman - age of a tree - age of a lake - it can be seen - size of a tree Now knowing that the number of rings in a tree trunk can be used to estimate the age of the tree and age of young trees is estimated from both trunk circumference and tree height, choose the best answer.
(Answer)
age of a tree

(Question)
You are presented with the question "What feature of many cacti help them survive in dry environments?" and the following answer choices: - exoskeleton - Spines for hunting - Expandable stems - an external framework - cactuses - Cooling pipes - genetic diversity - Loud organ pipes Now knowing that conserving water can be used for survival in a dry environment and many cacti have corrugated stems which can expand quickly if water becomes available, choose the best answer.
(Answer)
Expandable stems

(Question)
You are presented with the question "Plants are grown where they are protected from what?" and the following answer choices: - the sky - disease - storms - cold air - the water - the warmth - sun's heat - the cold Now knowing that agreenhouse is used to protect plants from the cold and plants are grown in greenhouses and protected from wild butterflies, choose the best answer.
(Answer)
the cold