Answers
evolution a process of biological change in which species accumulate differences from their
ancestors as they adapt to different environments over time
7 signs of life 1. living things contain nucleic acids, PRO, CHO, lipids
2. living things reproduce
3. living things use energy and raw material through metabolic activities
4. living things respond to the environemnt
5. living things maintain homeostasis
6. have cells
7. populations of living things evolve and have adaptive traits
how many themes of biology are there 5
whatre the themes of biology? 1. organization
2. information
3. energy and matter
4. interactions
5. evolution
how many levels of biological organization are there? 10
, whatre the 10 levels of biological organization 1. bioshpere
2. ecosystem
3. community
4. population
5. organisms
6. organs
7. tissues
8. cells
9. organelle
10. molecules
Biosphere Consists of all life on Earth and all parts of the Earth in which life exists, including
land, water, and the atmosphere.
ecosystem consists of all the living things of a particular area, along w all the nonliving
components of the environment along w interactions of organisms and the
physical environment
communities the array of organisms inhabiting a particular ecosystem
various kinds of plants and animals that belong to species
species a group whose members can only reproduce w other members of the group
populations consists of all the individuals of a species living within the bounds of a specified
area
organisms individual living things
organs Tissues are organized into:, group of tissues that work together to perform closely
related functions.
tissues Groups of cells with a common structure and function.
cells smallest unit of life--structure and function
organelles Structures specialized to perform distinct processes within a cell.
molecules Groups of two or more atoms held together by chemical bonds
atoms smallest unit of matter
reductionism an approach that reduces complex systems to simpler components thatre more
manageable to study--incomplete view of life on Earth
The cell is the _________________________ smallest unit of organization that can perform activities required for life
What is the main difference between prokaryotes and membrane-bound organelles
eukaryotes?
chromosomes contain ___________________ DNA