The main structural difference between LDL and HDL is their compositions. Approximately 50% of the weight of an LDL particle is cholesterol and only 25% is protein. High-density lipoprotein particles, on the other hand, consist of 20% percent cholesterol by weight and 50% protein.
Maintenance of normal fluid homeostasis requires all of these except caloric balance within the selections provided.
I am not sure what your selections are; this is your answer above however.
Freshwater ecosystems have been modified by the creation of dams and the withdrawal of water for human use, which have changed the flow of many large river systems. This in turn has had other effects such as reducing sediment flows, the main source of nutrients for estuary ecosystems.
Within terrestrial ecosystems, more than half of the original area of many types of grasslands and forests has been converted into farmland. The only types of land ecosystems which have been changed relatively little are tundra and boreal forests, but climate change has begun to affect them.
The distribution of species on Earth is becoming more homogenous. By homogenous, we mean that the differences between the set of species at one location on the planet and the set at another location are, on average, diminishing. The natural process of evolution, and particularly the combination of natural barriers to migration and local adaptation of species, led to significant differences in the types of species in ecosystems in different regions. But these regional differences in the planet’s biota are now being diminished.
Non-native species
Figure 1.7 Non-native species
Two factors are responsible for this trend. First, the extinction of species or the loss of populations results in the loss of the presence of species that had been unique to particular regions. Second, the rate of invasion or introduction of species into new ranges is already high and continues to accelerate apace with growing trade and faster transportation. (See Figure 1.7.) For example, a high proportion of the roughly 100 nonnative species in the Baltic Sea are native to the North American Great Lakes, and 75% of the recent arrivals of about 170 nonnative species in the Great Lakes are native to the Baltic Sea.
When species decline or go extinct as a result of human activities, they are replaced by a much smaller number of expanding species that thrive in human-altered environments. One effect is that in some regions where diversity has been low, the biotic diversity may actually increase—a result of invasions of nonnative forms. (This is true in continental areas such as the Netherlands as well as on oceanic islands.)
hope this helps im not sure it will
Complete question:
An important challenge to traditional (pre-1860) ideas about species was the observation that seemingly dissimilar organisms, such as hummingbirds, humans, and whales, have similar skeletal structures. This most directly suggested to biologists that __________.
a) only the best-adapted organisms can survive
b) advantageous changes can be passed along to offspring
c) most evolution occurs rapidly following a mass extinction
d) dissimilar organisms might have evolved from a distant, common ancestor
e) all of the above
Answer:
d) dissimilar organisms might have evolved from a distant, common ancestor
Explanation:
Many dissimilar organisms, such as hummingbirds, humans, and whales share some structural similarities such as common basic skeletal structures present in their body parts. This led the scientist to conclude that organisms with several observable differences share common ancestors. This is why these dissimilar organisms have some similar homologous skeletal structures.
For example, the bones present in the forearms of humans and whales are the same irrespective of their different outer morphology. This suggests that humans and whales share common ancestors.
The answer is A, the temperature would decrease because ice can’t really absorb heat