Question

Question 1Which of these is an example of a species changing over time?After the death of the chestnut trees, oak trees became the dominant species.A morning glory plant is found curled around the post of a mailbox.A birch tree in the forest reached its full mature height.A ground level plant develops curling tendrils that wrap around other objects so it can "climb."2 pointsQuestion 2When does diversity within a species occur?immediatelywithin one generationover many generationsnever2 pointsQuestion 3A species that adapts will be more likely to _________.become extinctmutatesurvivelive a shorter life2 pointsQuestion 4Which of the following structural adaptations helps an organism obtain food?dandelion seeds that can float in the windthe bright-colored skin of a poison dart frogthe long neck of a giraffethe cardinal's bright red coloring2 pointsQuestion 5Which structural adaptation would help a plant survive better in a shady environment?thornssmall leaveslarge leavesbrightly colored flowers2 points

Answer 1

The human brain is the central organ of the human nervous system, and with the spinal cord makes up the central nervous system. The brain consists of the cerebrum, the brainstem and the cerebellum. It controls most of the activities of the body, processing, integrating, and coordinating the information it receives from the sense organs, and making decisions as to the instructions sent to the rest of the body. The brain is contained in, and protected by, the skull bones of the head. The cerebrum is the largest part of the human brain. It is divided into two cerebral hemispheres. The cerebral cortex is an outer layer of grey matter, covering the core of white matter. The cortex is split into the neocortex and the much smaller allocortex. The neocortex is made up of six neuronal layers, while the allocortex has three or four. Each hemisphere is conventionally divided into four lobes – the frontal, temporal, parietal, and occipital lobes. The frontal lobe is associated with executive functions including self-control, planning, reasoning, and abstract thought, while the occipital lobe is dedicated to vision. Within each lobe, cortical areas are associated with specific functions, such as the sensory, motor and association regions. Although the left and right hemispheres are broadly similar in shape and function, some functions are associated with one side, such as language in the left and visual-spatial ability in the right. The hemispheres are connected by commissural nerve tracts, the largest being the corpus callosum.

Human brain