Which of the following is an important feature of primitive aquatic life forms?
Partially oxygenated blood
An open circulation with no small blood vessels or capillaries
Significantly decreased blood pressure
Highly acidic blood
Significantly decreased blood pressure is an important feature of primitive aquatic life forms.
Which of the following reason(s) make plants (both terrestrial and aquatic) important for the survival of all life forms?
Which of the following is a feature of primitive subsistence farming?