Transitional fossils are those fossils WHICH HAVE FEATURES THAT ARE INTERMEDIATE BETWEEN ANCESTORS AND DESCENDANTS. This type of fossils have characteristics traits that are common to both an ancestral group and its derived descendant group.
Explanation:
Plants use carbon dioxide in the atmosphere during photosynthesis, herbivores eat the plants, and a carnivore eats an herbivore.
It all depends on the species, some lose all of their leaves for part of the year while others lose their leaves before the next growing season, retaining some during winter or dry periods.
Abiotic because biotic is living. So abiotic is the opposite.