These messages are sent by nerves faster or hormones slower. Lichens can grow on bare rock, and slowly decomposes rocks to release nutrients essential for the growth of other living things.
Chloroplasts are found mainly in the palisade layer, and the spongy layer contains air spaces to allow gas exchange.
The main waste product is urea, the waste material produced from the breakdown of proteins. The ileum is long and has a very large surface area.
Most microbes are harmless, however, some microbes cause disease and are termed pathogens. The tissue fluid carries glucose, amino acids, and other useful substances to the cells.
Selective breeding involves breeding individuals who have the desired characteristics. Bile is stored in the gall bladder.
The ciliary muscles relax when viewing distant objects. Heterotroph An organism that obtains organic molecules by eating other organisms or substances produced by them. Veins carry deoxygenated blood towards the heart, at low pressure. Every three bases code for one amino acid, which join together to make proteins.
The Circulatory System Arteries carry oxygenated blood away from the heart.
Many animals have become extinct forever. Valves are needed to prevent the back-flow of blood. LH is released which stimulates ovulation, and the corpus luteum secretes progesterone to maintain the thick uterus lining.
Animals compete for food, water, mates and territory.
Hormones Chemical messages secreted by special glands and carried around the body in the blood, e. This coordinates all the information and sends a message to the effectors to bring about a response. Karyotype The set of chromosomes present in a particular type of organism, arranged in terms of their characteristic size and structure.
Core body temperature is monitored and controlled by the brain. They have a thick wall with plenty of elastic and muscle tissue to withstand the high pressure. Linkage The increased tendency of two alleles to segregate together because their loci are on the same chromosome.
Organism are adapted to their environment. Homeostasis Homeostasis is maintaining a constant internal environment. Receptors are often gathered together into sense organs, that have other various structures that help the receptors gain more information.Lesson 1 of an introduction to science for pupils starting in Year 7.
The lesson includes lesson ideas on health and safety in a lab, hazard symbols and rules. Included is a PowerPoint, activity sheets and a home learning task. International Scholars Tuition School (IST) is dedicated to providing the best 11+ Common Entrance Exams (CEE), 13+ Common Entrance Exams (CEE), 13+ Common Academic Scholarship Exams (CASE), Winchester College Entrance Exams, Eton College King’s Scholarship Exams, SSAT (Secondary School Admission Test), ISEE (Independent .Download