Because organisms at different tropic levels get their energy from the organisms at the lower tropic levels.
Answer:
A or C
Explanation:
Xylem consists of several different types of <u>cells</u>: fibers for support, parenchyma for storage, and tracheary elements for the transport of water. The tracheary elements are arranged as<u> long tubes through which columns of water are raised</u>. In a tree trunk, the innermost part of the wood is dead but structurally strong xylem, while the outer part consists of living xylem, and beyond it, layers of cambium and phloem.
Answer:
A biopsychosocial approach
Explanation:
This approach was first proposed by George Engel in 1977. It takes a look at a broader and whole view of a patient as it tends to ascertain how biological, psychological and social factors are interconnected in affecting the health of an individual. It is usually employed in Health psychology in dealing with disorders in patients.
Professor McIntosh’s emphasis that depression often involves the interactive influences of self-focused thinking (Psychological factor), rejection from others (social factor), and low serotonin levels (biological factor) clearly illustrates a biopsychosocial approach.
Answer:
There is no change, the lac l gene is constitutively expressed, regardless of the presence of lactose.
Explanation:
Lacl gene codes for the lac repressor hence is always expressed to produce lac repressors which may or may not be bounded dependent on the presence of lactose. Lacl gene expression is not regulated, thus is constitutively expressed.
Nervous system is much more systematic because the impulses are passed as messages through the neurons. The process and the response are very rapid. Endocrine system, on the other hand, is wide range. The process is slow and the effect is long-lasting.