Answer:
2
Explanation:
There are two kinds of photosystems: photosystem I (PSI) and photosystem II (PSII) (Fig. 3.3).
Only phylum bryozoans were not present during Cambrian period. It is an extensive fossil that did not appear in Cambrian nor pre-cambrian rocks. Bryozoans are found in the early Ordovician period. It could have probably existed during the Cambrian period but were soft-bodied or not preserved.
Tropical rain forest
Explanation:
The best ecosystem that would give the biologist the best chance of finding new kinds of plants to use for her research is the tropical rain forest.
The tropical rain forest is found around the equatorial region of the world. It is usually wet, moist and sunny here. Due to the plethora amount of solar energy available here, life is diverse.
The biologist would need different plant species to find her desired antibiotics. Tropical rain forest will present the best biodiversity for the studies.
Learn more:
Temperate and tropical forest brainly.com/question/10856870
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Pretty sure it’s 1 hopefully
