(Q).
Moss causes chemical weathering, and chemical weathering causes chemical changes in the minerals of a rock. Given these facts, what causes chemical changes in the minerals of a rock among the following options: - moss - hitting it with a hammer - steady temperature - bad music - copper - iron - sodium - coal
(A).
moss

(Q).
Chordates have a complete digestive system and a closed circulatory system, and vertebrates have a closed circulatory system. Given these facts, what group of animals do chordates belong to among the following options: - graptolites - more abundant - warm-blooded - four limbs - epidermal - Vertebrates - animals - insects
(A).
Vertebrates

(Q).
Urine is the liquid waste product of the body that is excreted by the urinary system, and mammals excrete urea in the watery form of urine . Given these facts, what is a waste product of the body that is excreted by the urinary system among the following options: - potash - food - CO 2 - sugar - urea - liquid - H 2 O - sulfur
(A).
urea