What is the chemical reaction that results when a pair of amino acids are chemically combined?
(1)ch4
(2)h2o
(3)hn3
(4)co2

"do a testcross with a homozygous recessive plant."

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

synapse nervous system