key terms definitions Flashcards
what does stimuli mean?
A stimulus is anything that can trigger a physical or behavioral change.
what does dry mass mean?
The mass of a biological sample after the water content has been removed, usually by placing the sample in an oven.
what is an ion?
An ion is an atom or group of atoms where the number of electrons is not equal to the number of protons.
what is homestostatasis?
Homeostasis is any self-regulating process by which an organism tends to maintain stability while adjusting to conditions that are best for its survival.
what is a kingdom?
the second highest classification and organism can be put into on the basis of their characteristics such as cell structure, mode of nutrition, mode of reproduction and body organization.
what is a blastocyst?
Three days after fertilization, a normally developing embryo will contain about six to 10 cells. By the fifth or sixth day, the fertilized egg is known as a blastocyst — a rapidly dividing ball of cells. The inner group of cells will become the embryo. The outer group will become the cells that nourish and protect it.
what is a heterotrophic?
A heterotroph is an organism that eats other plants or animals for energy and nutrients.
what does autotrophic mean?
relating to a living thing that can make its own food from simple chemical substances such as carbon dioxide:
what does saprophytic mean?
any organism, esp a fungus or bacterium, that lives and feeds on dead organic matter.
what is an exoskeleton?
a rigid external covering for the body in some invertebrate animals, especially arthropods.
what is terrestrial?
A terrestrial animal or plant lives on land or on the ground rather than in the sea, in trees, or in the air
