Which of the following is the first trophic level in every ecosystem ? A tertiary consumer
B primary consumer
C autotroph
D heterotroph

Cycling of Matter and Energy Quick Check

1.While detritivores feed on dead organic matter, decomposers actually break down dead or decaying organisms.

2.Food webs are more complex than simple food chains.

3.heterotrophs

4.autotroph

5.Matter and energy are cycled through the ecosystem.

Explanation:

:)

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.