B1 and B2

Characteristics of life

M- They follow the sun (movement)

R- They respire. Aerobic and Anaerobic (inside water, outside water) respiration

S- Systems in the human body coordinate hormones to oxygen and the nervous system. Plants respond to their environment. (senstivity)

G- Dry mass is measured to show how much new organic matter is found. (growth)

 R- There are two types, sexual and A sexual. (reproduction)

 E- Toxic materials, waste prodcucts of metabolism and excess substances. (excretion)

N- organic substances and mineral ions. (nutrition)

A question of scale

Every living thing is made up of a cell. Cells are the simplest unit of living matter that can exist and reproduce alone.

The unit we use to measure cells is micrometer.

1000 micrometers = 1 millimeter; 1000 millimeters = 1 meter

Cells are the basic units which make up living organisms. They are microscopic therefore cannot be seen properly unless magnified. Most cells are less than 0.1 mm in diameter.