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TLS Online TPP Program

#Question id: 8927

Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that

#XL - R Botany
  1. arthropods have had more time to co-evolve with land plants than have vertebrates.
  2. extant terrestrial arthropods are better adapted to terrestrial life than are extant terrestrial vertebrates.
  3. ancestral arthropods must have been poorly adapted to aquatic life, thus experienced a selective pressure to invade land.
  4. vertebrates evolved from arthropods.
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TLS Online TPP Program

#Question id: 27438

#XL - R Botany

The total number and types of organism on earth represent the
TLS Online TPP Program

#Question id: 4963

#XL - S Microbiology

Which free-living cells were the earliest contributors to the formation of Earthʹs oxidizing atmosphere?
TLS Online TPP Program

#Question id: 14884

#XL - S Microbiology

Which types of cell shows the middle affinity towards the self proteins? 
TLS Online TPP Program

#Question id: 6966

#XL - T Zoology

During gastrulation in the frog, the very first cells to move into the interior of the embryo through the blastopore come from the surface layer of cells in the marginal zone; they will become:
TLS Online TPP Program

#Question id: 29556

#XL - R Botany

Which of the following are the water-conducting cells of xylem, have thick walls, and are dead at functional maturity?