1. Which molecule can diffuse from the digestive tract
into the human bloodstream without first being
digested?
A) Protein
B) starch
C) fat
D) glucose

Internal feedback works to maintain homeostasis when your a. heart rate decreases as your white blood cells increase b. breathing rate decreases as your red blood cells decrease c. heart rate increases as your liver is cleaning blood d. breathing rate increases as your heart rate increases

Which is an innovation of gymnosperms? gymnosperms are the first seed plants. gymnosperms are the first flowering plants. gymnosperms are the first vascular plants. gymnosperms are the first spore plants.

Which nutrient tends to cycle within a single ecosystem?