unit 1
An astronomer says, “The largest planet in the solar system is Jupiter.”
inference
or
observation?
inference
Which options are key points of cell theory?
All living things come from previously living cells.
All living things are made up of one or more cells.
Different species have different numbers of chromosomes. The number of chromosomes is not related to the size or apparent complexity of the organism__blank___ have 41 total pairs of chromosomes, or 82 in every cell.
Great white sharks
__blank__ are layered rock-like structures formed by films of bacteria. Large populations of bacteria are often covered with mucus. Dirt and other solids may get trapped inside the mucus, eventually forming rocks. Fossil stromatolites are among the earliest fossils known and date back more than 3 billion years ago.
Stromatolites
Plants typically have innate behaviors and do not usually have learned behaviors. However, there are some curious exceptions. A plant called the ___blank__ has leaves that close when something disturbs them. Researchers performed an experiment in which they repeatedly dropped the plant.
Mimosa pudica
Theories do not form overnight. They often start smaller, as observations and suggested explanations. For example, _blank_______ published his version of the theory of evolution in 1859, in the book On the Origin of Species. But, he had been working on the ideas in it for over 20 years.
Charles Darwin
The___blank_____ is a thin outer covering that surrounds the body of a cell. All cells have a cell membrane. The membrane separates the body of the cell from outside.
cell membrane
__blank___ is most famous for his experiments on peas, but he also tried to study inheritance in animals. He kept numerous bee hives but, because of complications in working with bees, his experiments were not successfu
Mendel
Today, more than __blank__ years after Darwin published his book, a lot of scientists use principles of evolution in their daily work
150
__blank__ fly between the Arctic (near the North Pole) and the Antarctic (near the South Pole). These amazing birds do this flight every year. The distance this bird flies in its lifetime is equal to three times the distance between Earth and the moon.
Arctic terns
in 18th century Europe, _blank___ was a deadly concern. There were numerous patterns related to __blank__. For example, if a person got the smallpox and survived, they would not get sick from _blank___ again
small pox
Prokaryotic cells, like ___blank___ cells, do not have organelles. This means that they do not have mitochondria. So how do they get their energy?
bacteria
Punnett squares were first used by ___blank___, an English scientist. Punnett wrote one of the first textbooks about genetics.
Reginald Punnett,
In South America, Darwin ate a __blank_-, and a rhea (a flightless bird). In the Galapagos Islands, he ate Galapagos tortoises.
puma
__blank__ is the tiredness a person feels after traveling across different time zones. This is caused by the body being out of synch with the time it is in.
jet lag