Explanation:
When water turns to ice, it expands/contracts
The (molecules) in water is more tightly packed than in ice, so water has greater density than ice. Don't let the fact that ice is a solid fool you!
Bone marrow contains stem cells that give rise to all of yur blood cells.
The conclusion that coral does not grow well in conditions with high salt is invalid because (B) The experiment changes more than one variable at once.
In order to correctly study the effect of three variables on there needs to be, 3 x 3 x 3 = 27 different aquariums (every variable takes 3 different values and there are 3 different variables).
In these aquariums, only one condition needs to be varied at a time to study its effect. To study the condition with high salt, the temperature and pH needs needs to be kept fixed at a particular value whilst varying the salinity from normal to low to high.
D.) Fossils. Fossils are skeletons of creatures that lived in the past.
Image and options are not provided in the question, the image is attached below and the complete question is as following:
Study the image. Which best describes what the picture shows? an organism a community:
A. an organism
B. a community
C. a niche
D. a population
Answer:
D. a population
Explanation:
Biological organization is defined as a hierarchy of complex biological structures and systems on the basis of several related philosophical ideas.
It shows the arrangment of organism or biological structures from simplest form to complex, it includes atom, molecule, organelle, tissues, cells, organ systems, organisms, populations, communities, ecosystem, and biosphere (not arranged in sequential manner).
The given picture is related to a population because it shows groups of organisms of the same species, that is rats.
Hence, the correct option is D.