Under times of great stress or shock, which of the following neurotransmitters interferes with the perception of pain?
A) endocannabinoids
B) GABA
C) catecholamines
D) enkaphalins
E) calcium ions
D) enkaphalins
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Which tissue gives rise to secondary xylem and phloem?
a. protoderm b. apical meristem c. ground meristem d. vascular cambium
e. procambiumMycorrhizae
a. increase plant growth. b. are symbionts. c. concentrate nutrients they then share with plants. d. increase the surface area for absorption. e. are described by all of these.
In oceans, how does the vertical movement of cold water affect surface organisms?
A) by bringing nutrient-rich water to the surface B) by bringing oxygen-rich water to the surface C) by bringing waste down to the sea floor D) by increasing productivity via warmer temperatures
As sources of food and other products, members of the ________ family, including soybeans and peanuts are second only to grasses in terms of importance to humans.
A. Rose B. Euphorb C. Pea D. Willow E. Potato