Answer:
c
Explanation:
due to low light illumination there would very low level of oxygen at the bottom of the sea therefore hindering the survival of these organisms
c. Iridium
Explanation:
The layer of clay that marks the boundary between the Mesozoic and Cenozoic is rich in iridium. Iridium is an element that is rare on the earth crust. It is found in other astronomical bodies.
- The Cenozoic/Mesozoic boundary is an extinction time zone on earth in which nearly all organisms were wiped out.
- During this period in time, scientists believed that a large bolide collided with the surface of the earth sending all lives to death.
- Meteorites are rich in iridium and during the collision, they released a significant proportion in earth materials.
- This is why iridium was observed by Walter Alvarez in significant proportion in Italy.
Learn more:
Meteorite brainly.com/question/6372454
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Yes they are vascular like other gymnosperms
The chemicals used for the process
Answer:
The second one is correct
Explanation:
A leukocyte is responsible for the immune system
