Term applied to dicot trees, as opposed to softwoods, a term applied to gymnosperms. The multicellular, chambered, muscular structure that pumps blood through the circulatory system by alternately contracting and relaxing. A type of lymphocyte that stimulates the production of antibodies by activating B cells when an antigen is present. A red pigment in red blood cells that can bind with oxygen and is largely responsible for the blood's oxygen-carrying capacity. Hemophiliacs suffer from an inability to clot their blood.
Herbivores function in food chains and food webs as primary consumers .
The sex with two different chromosomes , such as males in humans and Drosophila . Proteins associated with DNA in eukaryote chromosomes . The ability to maintain a relatively constant internal environment. Also commonly referred to as homologous chromosomes. A peptide hormone secreted by the chorion that prolongs the life of the corpus luteum and prevents the breakdown of the uterine lining.