Yes.
No, an aspen tree is part of the populus genus. Only the trees from the birch genus (Betulus) produced catkins as the male pollinating adaptation The aspen Populus tremula does produce catkins in late winter and early spring. They are long and grey.
Willow and Alder.
Elm trees are deciduous
Elm trees are endangerd
No, animal eats elm trees but several other animals live inside elm trees.
Yes, red maple trees (Acer rubrum) produce catkins, which are slender, cylindrical flower clusters. These catkins appear in early spring before the leaves emerge, with male catkins being longer and more noticeable than female ones. The flowers are typically red or yellow and are an important source of nectar for pollinators.
No.
No.
It depends on which species of elm you are talking about. Elms belong to the genus Ulmus. The American elm is Ulmus americana.
Elm is the common name of the genus of trees called Ulmus
Cats don't produce catkins. Catkins are slim, cylindral flower cluster with inconspicuous or no petals produced by some plants.