What is the feature of horsetails that was useful before the existence of scouring pads?

a. rhizomes
b. silica in the stems
c. photosynthetic cells
d. cones at the tips
e. scale-like leaves


b

Biology & Microbiology

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The plant hormones known as ___________ may have an evolutionary origin in the common ancestor to both plants and animals.  

A.  brassinosteroids B.  oligosaccharides C.  cytokinins D.  auxins E.  abscisic acids

Biology & Microbiology

The Irish potato famine in the mid 1840s was caused by which heterotrophic protist decomposer that secreted digestive enzymes onto potatoes?

a. A water mold b. A red algae c. A nematode worm d. A protozoan e. A fungus

Biology & Microbiology

A degenerative brain disorder transmitted by cannibalism is called ________

A) kuru B) scrapie C) Creutzfeldt-Jakob disease D) herpes

Biology & Microbiology

Biomes

What will be an ideal response?

Biology & Microbiology