What happens at a spring tide?
A There is only one high tide each day.
B There is only one low tide each day.
C There is the most difference between
consecutive high and low tides.
D There is the least difference between
consecutive high and low tides.

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.