A group of students is trying to grow a kelp plant in a tank without any others animals. They use a temperature regulation system to keep the
water temperature at about 12°C. They bury the holdfast below the soil that has been enriched with nutrients and place the plant near a window
in direct sunlight. However, over a few weeks the kelp plant withers and dies. Why did this happen?
A.
The kelp draws nutrients from the water rather than the soil, which it does not have available.
X. B.
The water temperature is too low for the kelp plant to survive.
C Kelp cannot grow in direct sunlight and need to be kept in a shaded location.
D. Kelp only grows in freshwater, and salt water is harmful to kelp.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.