Which is produced when an egg and a sperm unite during a plant’s life cycle? a)spore
b)meiosis
c)zygote
d)gametophyte

Which of the following best describes homeostasis? a. keeping the internal environment in a stable state b. keeping the external environment in a stable state c. beneficial characteristics resulting from mutation d. reproduction that results in offspring identical to the parent.

Which prevent errors in dna replication? a. helicase enzyme checks the dna for errors. b. each base can attach to only one other type of base. c. ribosome enzymes prevent errors from happening. d. dna contains no complementary base pairs.

Any sound above what db can cause hearing loss in human beings