Spawn (egg-mass). While in the amplexus position, the male frog fertilizes the eggs as they get are laid. Frogs tend to lay eggs single eggs in masses, whereas toads usually lay eggs in long chains. Some frogs leave after this point, but others stick around to watch over the little ones. Some have very unusual ways of caring for their young. You'll learn about some of those later in this tour!.
sodium and potassium answer: protein 2. This organ shows a remarkable degree of degeneration (involution) with age. lymph node thymus spleen pharyngeal tonsil appendix Answer: thymus 3. Immune surveillance is a process in which ____________ nonspecifically detect and destroy foreign cells and diseased host cells. T lymphocytes (T cells) reticular cells dendritic cells macrophages natural killer (NK) cells answer: natural killer cells 4.
The immune system is a collection of different body systems and cells that protect our body from bacterial and viral infection.This biological system identifies and attacks foreign cells and materials through specialized cells called B-cells.5 Jun, 2011 Health 0. The immune system is a collection of different body systems and cells that protect our body from bacterial and viral infection. This biological system identifies and attacks foreign cells and materials through specialized cells called B-cells.