Cell Work Unit Test A scientist fills a glass container with water and places an aquatic plant inside the container, then closes the lid and
places the container in direct sunlight. The scientist observes small bubbles on the surfaces of the plant's leaves on
days 1 and 2, but no bubbles on day 3. The scientist concludes that the bubbles were caused by photosynthesis.
Which substance should be added to the water in order for the bubbles to reappear? (1 point)
Item 1
Item 2
Item 3
o hydrogen gas
Item 4
Oglucose
Item 5
O oxygen
Item 6
carbon dioxide

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas