Why are there more herbivores than carnivorous in a typical ecosystem?

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

What maintain homeostasis when a persons internal body temperature is 97.5°f