Spring officially begins each year on the Vernal Equinox, which falls on March 20 this year. That’s what your calendar says.

Spring officially begins each year on the Vernal Equinox on March 20. That’s what your calendar says. Ask a group of ...

Leaf development describes the coordinated morphogenesis process by which a leaf is formed, and grows to become a mature photosynthetic organ. It starts from the initiation of a primordium in the ...