Answer:
Variations are caused by mutation. random mating between organisms.
Explanation:
Answer:
#1 false its difficult but also possible. #2 true and #3 False. the Salivary gland in the mouth make 1.5 liters a day
In a cactus, carbon is fixed only during the day. this is because cacti need sunlight to perform photosynthesis. Have a great day :)
Answer:
C. Burying dead/religious beliefs