Introduction to the Science.ec 5 lesson 1 for Unit 6: Life Cycles in Ecosystems

1. Block 6 – Lesson 1

3. All organisms interact
with environmental
factors such as:
-Water
-Air
-Soil and
-Sunlight
These factors are needed
for the life cycle:
Birth, development, into
an adult, reproduction and
death.

5. The life cycle may be
interrupted when any
change in one part of an
ecosystem upsets its
balance within the limits of
tolerance of organisms. If
environmental conditions
are extreme, like forest fires,
droughts, floods, frost, or
accumulation of toxic gases,
certain organisms might
perish. These problems
appear for natural reasons
or because of human
activities.

7. Living things have their
own ways of adapting to
external factors that
affect their survival. Some
migrate to other places
and others adjust
themselves to the new
situation.
Human beings face
changes with knowledge
and technological
instruments. For example,
they use artificial
insemination in cases of
infertility.