Answer:
D.) often exists as a single-stranded molecule
Explanation:
One notable difference between DNA and RNA is that DNA consists of 2 nucleotide strands and RNA consists of 1.
Answer:
An endangered species recovery plan is a document describing the current status, threats and intended methods for increasing rare and endangered species population sizes.
Explanation:
When recovery plans are carried out well, they do not simply act as stop gaps to prevent extinction, but can restore species to a state of health so they are self-sustaining. There is evidence to suggest that the best plans are adaptive and dynamic, responding to changing conditions. However, adaptive management requires the system to be constantly monitored so that changes are identified.[10] Surprisingly this is frequently not done, even for species that have already been red listed.[11] The species must be monitored throughout the recovery period (and beyond) to ensure that the plan is working as intended. The framework for this monitoring should be planned before the start of the implementation, and the details included in the recovery plan. Information on how and when the data will be collected should be supplied.
Answer: Hormone
Explanation:
A hormone is a chemical substance produced in small quantities by an endocrine gland (such as thyroid gland in the neck) and carried in the blood to another tissue in the body where it acts as a messenger to control itsfunction.
Examples of hormones include:
- Thyroxine produced by the thyroid gland in the neck
- Testosterone produced by the testis in male humans
- Oestrogen produced by the ovary in female humans
Answer:
B. The amount of energy used and wasted to produce useful energy.
Explanation:
Net energy is the total amount of energy your home imported from or exported to the utility grid. To see net energy in MyEnlighten, your system must have consumption metering hardware installed.
The formula for the work done in emptying a tank is this:
W = ωyV
where
ω is the specific weight
y is the center of gravity
V is the volume of the liquid
The specific weight can be calculated using the formula
ω = ρg
where
ρ is the density
g is the acceleration due to gravity
Solving for ω
ω = 817.15 kg/m3 (9.81 m/s2)
ω = 8016.24 N/m3
The center of gravity of a completely filled cylindrical tank is just 1/2 of the height. So,
y = 3 cm
The volume of the kerosene is just the volume of tank. Using the formula for the volume of a cylinder
V = πr²h
V = π (3²) (6)
V = 54π m³
Therefore, the word done is
W = 8016.24 (6) (54π)
W = 8159538.47 J or
W = 8.16 MJ
