SCIENCE-THIRD PRIMARY YEAR CEIP CORTES DE ARAGÓN(Teacher: Miguel Navarro)

WE CAN CLASSIFY PLANTS INTO DIFFERENT GROUPS ACCORDING TO THEIR STEMS:

THEY HAVE A SOFT STEM. THEY ARE THIN, FLEXIBLE AND USUALLY SHORT.

EXAMPLE: WHEAT (TRIGO). IT HAS A LONG STEM AND MANY KERNELS AT THE END OF EACH STEM. WE MAKE BREAD FROM WHEAT.

- THEY HAVE WOODY STEMS WITH LOW BRANCHES.THEY ARE TALLER THAN GRASSES AND LIVE LONGER.

- EXAMPLE: BLACKBERRY BUSH (ZARZAMORA

THEY HAVE A THICK, WOODY STEM CALLED TRUNK.

WE CAN DISTINGUISH: DECIDUOUS TREES: LOSE ALL THEIR LEAVES IN AUTUMN (OAK TREES)

EVERGREEN TREES: PRODUCE LEAVES DURING ALL THE YEAR (PINE TREES)

THE FIRST LIVING THINGS APPEARED ON OUR PLANET OVER 2000 MILLION YEARS AGO.

FOSSILS TELL US WHAT LIVING THINGS LOOKED LIKE MILLION OF YEARS AGO.

OVER TIME, LIVING THINGS HAVE CHANGED TO ADAPT TO THEIR ENVIRONMENT.

(LOOK AT PAGE 43)