Why have biologists hypothesized that the first land plants had a low, sprawling growth habit?
A) They were tied to the water for reproduction and thus needed to remain in close contact with the moist soil.
B) The ancestors of land plants, green algae, lack the structural support to stand erect in air.
C) Land animals of that period were small and could not pollinate tall plants.
D) There was less competition for space so they simply spread out flat.
B
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What is the advantage of sexual reproduction during adverse environmental conditions?
a. Genetically different offspring may survive better in changing environments. b. Sexual reproduction is less time consuming. c. Sexual reproduction is less energetically expensive. d. It allows for the production of a large number of offspring in a short time period.
In 1882, the tropical volcanic island Krakatoa
exploded and was reduced to an abiotic island covered by a thick layer of volcanic ash. By 1933, populations of all of the following organisms were present. Which population was probably established after the others? a. ferns b. bacteria c. insects d. rodents e. mosses
Multiprotein complexes known as ________ minimize diffusion distances and facilitate electron flow between electron transport complexes
Fill in the blank with correct word.
During elongation, the charged tRNA is recruited to which location on the ribosome?
What will be an ideal response?