Characteristics of Life
This characteristic refers to maintaining stable internal conditions despite external changes.
Homeostasis
This is the smallest unit capable of performing all activities required for life.
Cell
This process converts sunlight into chemical energy by powering the assembly of food molecules.
Photosynthesis
Sweating and vasodilation are examples of this type of feedback.
Negative feedback
Darwin described evolution as this phrase meaning species change over generations.
Descent with modification
This life characteristic includes all chemical reactions inside a cell.
Metabolism
A group of cells with a common structure and/or function forms this level.
Tissue
This process transforms food molecules into ATP for cellular work.
Cellular respiration
Oxytocin release during childbirth is an example of this type of feedback.
Positive feedback
This scientist co-developed the idea of natural selection alongside Darwin.
Wallace
The Venus flytrap closing on prey and pupils dilating are both examples of this characteristic of life.
Response to stimuli
This level consists of interacting populations in a particular area.
Community
The cycling of nutrients and flow of this resource are central to understanding metabolism.
Energy
This bodily response widens blood vessels to cool the body.
Vasodilation
Variation among individuals is caused by these changes in DNA.
Mutations
This characteristic explains why individuals better suited to their environment survive and pass down their traits.
Evolutionary adaptation
This level of organization includes all living things in an area and the nonliving components such as soil, water, and air.
Ecosystem
This term refers to all chemical reactions occurring within a cell.
Metabolism
This positive feedback loop contributes to global warming by increasing exposed water that absorbs heat.
Arctic sea ice melting
The observation that species tend to match their environment (like camouflage) supports this Darwinian idea.
Natural selection
These two processes involve transmitting genetic information and producing new individuals.
Reproduction and development
Emergent properties arise at this highest level, which includes all life and the placees where life exists.
The flow of energy and this continuous reuse of biological materials sustain ecosystems.
Nutrient cycling
This term describes the “ideal” internal level that negative feedback tries to return to.
Set point
The observation that populations produce more offspring than can survive leads to this evolutionary pressure.
Competition