Which of the following  cells control the differentiation of HSCs (hematopoietic stem cells )?

#Question id: 11329

#XL - R Botany

Which of the following aquatic systems is like a tropical rain forest because of its richness of biological production and diversity of inhabitants?

#Question id: 11330

#XL - T Zoology

Bio geographers have noted that the tropics have more terrestrial species than temperate regions. Which of the following is NOT a plausible explanation for this pattern?

#Question id: 11330

#XL - R Botany

Bio geographers have noted that the tropics have more terrestrial species than temperate regions. Which of the following is NOT a plausible explanation for this pattern?

#Question id: 11331

#XL - T Zoology

Based on the intermediate disturbance hypothesis, a community’s species diversity is increased by

#Question id: 11331

#XL - R Botany

Based on the intermediate disturbance hypothesis, a community’s species diversity is increased by

#Question id: 11332

#XL - T Zoology

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

 A) tropical communities are older.

 B) tropical regions generally have more available water and higher levels of solar radiation.

 C) higher temperatures cause more rapid speciation.

 D) diversity increases as evapotranspiration decreases.