Answer:
Car 1 will roll down the ramp and exert a force on car 2. The force experienced by car 2 is measured indirectly using t<u>he distance it travels or its speed
.</u>
. If the force increases, car 2 will travel <u>slower or farther</u> The independent variable, or what’s being manipulated in the experiment, is <u>the starting height of car 1 or the type of bumper attached to car 2
</u>
he dependent variable, or what’s responding, is <u>the distance car 2 travels or the speed of car 1
</u>
The height and starting position on the ramp are constants in this experiment.
Explanation:
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Calcium levels in the body are maintained by hormones. If the blood calcium level rises above a set point, calcitonin is secreted by the thyroid gland and sets into motion responses to lower the blood calcium back to the set point. If the blood calcium level falls below a set point, the parathyroid gland secretes parathyroid hormone that sets into motion responses to raise the blood calcium. These homeostatic responses are examples of:
a. positive feedback
b. effectors
c. sensors
d. negative feedback
Answer:
d. negative feedback
Explanation:
Negative feedback responses are the ones that counteract the change. Any alterations in the internal body conditions such as blood calcium levels are sensed by receptors. The information is sent to the brain which in turn commands the effectors such as endocrine glands to secrete the required hormones to restore the normal conditions. Here, changes in the calcium levels are counteracted by the secretion of calcitonin and parathyroid hormones and the calcium is maintained within a narrow range. This represents negative feedback.
The scarlet ibis (Eudocimus ruber) is a species of ibis in the bird family Threskiornithidae. ... Traditional Linnaean taxonomy classifies it as a unique species, but some scientists have moved to reclassify it as a ... More recent observation, however, has documented significant crossbreeding and hybridization in the wild.
The tissue that makes up most of the fleshy part of a plant is the vascular tissue.
The answer to the second question is A. Vascular and Parenchyma tissues.
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