Biology, General and Medical

activity amoeboid antigen appear bacteria become biophores blastula blood body buds cavity changes characters chemical chemotropic chromosomes cilia Class complexity conjugation containing corpuscles cytoplasm Darwin determinants differentiation digestive disease division ectoderm effect eggs embryo female fertilized fibres flagella flowers fluid followed formation function gametes gemmules geotropic germ cells germ plasm germinal cells graft groups grow growth higher animals host hybrid hydra immunity increase individual insects irritability kind known larvæ layer living substance living things male ment microparasites mitosis modified molecules muscle nature nervous system nuclear nucleus number of chromosomes nutrition offspring organisms ovum parasites parent peculiar physiological plants primitive produced protoplasm protozoa pseudopods reactions reflex regeneration reproduction segments separate serum sexual simple skin somatic species spermatocytes spermatozoa spores stage stimulation structure surface tail takes place tentacles theory tion tissue toxin transplanted usually vacuoles vegetable vertebrates worms yolk