In what times of year are tropical cyclones most likely to form? a. summer and fall b. spring and summer c. winter and spring d. fall and winter

B.

Explanation:

In spring and summer where storms are more present and frequent. During summer, there is more moisture in the air (since more water evaporates during summers heat), an important ingredient for storm-formation.

Hope it helped,

BiologiaMagister

the answer to your question is tooth decay.

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.