Biology, 17.10.2019 02:50 fortwill05
Some species of present day protists contain living organisms within their cytoplasm. paramecium bursaria are hosts for zoochlorellae, photosynthetic protists, that live within the cytoplasm of the paramecium. the relationship appears to be symbiotic; the zoochlorellae gain protection and possibly some essential nutrients from the host cytoplasm and the paramecium host has an available food source when its usual food source is depleted. this symbiotic relationship provides support for the theory of endosymbiosis, which states that a) animal-like cells evolved from ancestors that were photosynthetic. b) mitochondria and chloroplasts evolved from small prokaryotes living within larger cells. c) photosynthetic organisms, like today's land plants, evolved from photosynthetic bacteria. d) heterotrophic organisms could not have evolved before the evolution of photosynthetic organisms.
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Biology, 22.06.2019 02:30
Are the earth's ocean floor and continents the same age geologically? why or why not?
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Biology, 22.06.2019 03:00
Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils
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Biology, 22.06.2019 04:30
The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane
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Biology, 22.06.2019 05:30
The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen
Answers: 1
Some species of present day protists contain living organisms within their cytoplasm. paramecium bur...
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