The summer solstice is the first day of summer. This day, June 21, is the longest day of the year.
Xylem are tubes in the stem that transport water and minerals upward, from the roots to the leaves. Phloem are tubes in the stem that move food made in the leaves to other parts of the plant. ... Chlorophyll is a pigment that helps plants use energy from the sun to produce sugars.
he three steps in the process of DNA replication are initiation, elongation and termination.
Replication Basics. Replication depends on the pairing of bases between the two strands of DNA. ...
Initiation. ...
Elongation. ...
Termination.
