Any environmental resource that, because it is scarce or at unfavorable levels, restricts the ecological niche of an organism is called

In sexual reproducing animals once fertilization of the egg takes place, the exists as a single cell until cell division begins. a) egg b) larva c) sperm d) zygote

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.