The main hormone that acts on the kidneys to regulate sodium ion concentration of the extracellullar fluid (ecf) is:

What adaptations can prey use to avoid predation

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

How does a gymnosperm prevent itself from pollinating the same tree