PLEASE HELP I DONT HAVE MUCH TIME A keystone species is a species whose presence
a Influences the population size of many other species in its community
b Is an indicator of environmental health
c Is the main reason a community exists
d Is always at the top of the trophic levels as a top predator e Provides food for all other species in a community

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.