(Q).
Veins generally carry deoxygenated blood, and veins carry blood to our heart. Given these facts, deoxygenated blood is carried where among the following options: - to our heart - during the day - animal transport - our planet - critical organs - mouth of rivers - humans - organs
(A).
to our heart

(Q).
The number of rings in a tree trunk can be used to estimate the age of the tree, and tree rings record the seasons. Given these facts, how can we learn about the seasons by using a tree among the following options: - Tasting the tree leaves - Something that can be auburn - it keeps an organism warm - Measuring the height of the tree - Help plants grow - By looking at the trunk - Something that is self-aware - Chopping down the tree
(A).
By looking at the trunk

(Q).
Playing is one way mammals and other animals learn how to behave, and exercise is fun if it is also play. Given these facts, what can teach animals how to behave among the following options: - adding heat - humans - fossil fuels - A computer - nerves - people - irradiation - exercise
(A).
exercise