Primary producers use an energy source (usually sunlight) to build organic molecules.
Having more then one independent variable will give unreliable results. Hope this helps
Answer:
The cells belong to the tissue level of organization
Explanation:
Living organisms are composed of four levels of organization; the cell, tissues, organs and organ systems.
The cell is the basic unit of life and the smallest level of organization.
Tissues are group of cells with a common origin which work together to perform a similar function.
Organs are composed of different types of tissues and perform various complex functions. in the organism.
Organ systems are groups of organs that perform similar functions or which work together for a specific function.
A plant leaf is an organ which is made up of various tissues such as the dermal, vascular and ground tissues.
The dermal cells known as the epidermis belong to the tissue level of organization as they perform a similar function of protecting against mechanical injury and invasion by microorganisms
Explanation:
Whereas primary tissues allow for vertical growth, secondary tissues allow for lateral growth: they allow stems and roots to become wider. In roots, the formation of both secondary meristems involves the pericycle.
The answer is Catecholamine. It is any of a class of aromatic amines that includes a number of neurotransmitters such as epinephrine and dopamine. The adrenergic receptors are a class of G protein-coupled receptors that are targets of the catecholamines, especially norepinephrine (noradrenaline) and epinephrine (adrenaline). These three - catecholamine, peptide hormones and eicosanoids acts as extracellular membrane receptors which means that these receptors are embedded in the membranes of cells. They act in cell signaling by receiving (binding to) extracellular molecules.
