Proterozoic era characterized by___

a) Origin of life

b) Fossils of blue green algae

c) Most invertebrate evolved

d) First gymnosperm

e) Abundance of marine algae

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#Question id: 14483

#Unit 13. Methods in Biology

In a garden 40% of the flowers are roses and the rest are carnations. If 25% of the roses and 10% of the carnations are red, the probability that a red flower selected at random is a rose.

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#Question id: 2967

#Unit 2. Cellular Organization

G1 is associated with which of the following cellular events?

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#Question id: 10741

#Unit 10. Ecological Principles

My backyard borders a forest; when my backyard is well-maintained, where it and the forest meet is a(n)

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#Question id: 15477

#Unit 12. Applied Biology

Why these metabolites are manufactured by microbial fermentation rather than chemical synthesis 

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#Question id: 15776

#Unit 5. Developmental Biology

Which stem cells play critical roles in fueling organogenesis in the embryo and regeneration in adult tissues?

A. Adult stem cells.

B. Embryonic stem cells

C. True stem cells

D. Tissue specific stem cells