why must the life cycle of sexually reproducing species alternate between haploid and diploid stages?

What angle should your knees not bend past when squatting? a. 30 degrees b. 45 degrees c. 90 degrees d. 120 degrees

Which of the following is also referred to as "swayback"? a. kyphosis b. scoliosis c. lordosis d. none of the above

The virus genome and viral proteins are assembled into virions (virus particles) during ) the lytic cycle and the lysogenic cycle in all known host organismsb) the lysogenic cycle onlyc) the lytic cycle onlyd) the lytic cycle in all host organisms but the lysogenic cycle only in bacteria