Answer:
During interphase, centrosomes are duplicated.
Explanation:
Interphase is one of the two phases of cell cycle (other being mitotic phase).
Interphase is characterized by cell growth and DNA replication. It is subdivided into:
• G1 phase (the first gap phase) - the cell grows and becomes larger and copies organelles
• S phase – DNA and microtubule-organizing structure-centrosome are duplicated.
• G2 phase - proteins and organelles are formed.
G2 phase is followed by the beginning of mitotic phase.
Answer:
Option (3)
Explanation:
Springs (hot springs) and geysers are formed when the water from the interior of the earth are ejected into the earth's surface. In simple words, these are formed in the region where the groundwater and the ground surface intersects with each other.
The water obtained from springs can be cold or hot. Those that produce hot water are termed as hot-spring. These hot springs and geysers indicates the occurrence of volcanic activity. This water becomes hot due to the interaction with the magma at certain depths below the ground surface.
The geysers are also a type of hot-springs which produces hot water.
Thus, the correct answer is an option (3).
Answer: He supported polygeny through his work measuring human skull volumes. He measured modern and ancient skulls and concluded that the human race (or species) could be ranked on a scale of intelligence. He concluded that the ancient Egyptians were not African, but were Caucasian.
