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2 years ago

A basic observation of a star is how bright it appears. This brightness is known as the star's

Biology

2 answers:

balu736 [363]2 years ago

8 0

Answer:

B. apparent magnitude

Rashid [163]2 years ago

6 0

The answer would be apparent magnitude as one would likely be measuring its brightness from the viewing space of earth. It would more likely be absolute if its actual brightness relative to other stars rather than just from earth was to be measured.

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Which of the following tissues, cells, or structures in flowering plants is a part of the sporophyte generation and therefore di

jeka94

Answer:

Cell of and integument

Explanation:

When flowering plants reproduce by sexual reproduction, they form seeds contained into fruits. The fruit is derived from the maturation of the flower's ovary (female part) after fertilization.

A mature seed contains three generations:

a diploid embryo (the new sporophyte),
The embryo is surrounded by haploid female gametophyte tissue that supplies nutrition
All the above structure is in turn surrounded by the seed coat (diploid parental sporophyte tissue). The seed coat is produced by integument cells to protect the embryo during its development and before its can germinate. As it is produce by it parental plant, its ploidy level diploid.

In contrast, the generative nucleus and sperm cell are part of male gametophyte (pollen grain) and therefore haploids. Synergid cell is part of embryo sac, therefore belongs to female gametophyte and thus being haploid. Finally, cell of endosperm is usually derived from the fusion between a sperm cell and one of the two female gametes present within the embryo sac, thus being triploid.

7 0

3 years ago

A sand storage tank used by the highway department for winter storms is leaking. As the sand leaks out, it forms a conical pile.

harina [27]

Answer:

Rate of change of volume of the pile $= 54\pi$

Explanation:

Given -

Rate of increase of the base of the pile $= 0.75$ inches per minute

Height of the pile $= 2 *$ the radius of the base

Let "h" be the height of the pile and "r" be the radius of the base.

Then $h = 2* r$

Radius "r" $= 6$ inches

Rate of change of radius i.e

$\frac{dr}{dt} = 0.75$

Volume of conical pile

$\frac{\pi }{3} * r^2 * h\\= \frac{\pi }{3} * r^2 * 2 * r\\= \frac{\pi }{3} *2* r^3$

Change in volume of conical pile

$\frac{dV}{dt} = \frac{dr}{dt} * \frac{6* \pi * r^2 }{3}$

Substituting the value of rate of change of radius, we get -

$\frac{dV}{dt} = 2 * \pi * (6^2) * (0.75)\\\frac{dV}{dt} = 54 \pi$

Rate of change of volume of the pile $= 54\pi$

8 0

3 years ago

What conclusion can be drawn from the Theory of Plate Tectonics?

Ivan

Answer A. If the tectonic plates continually move then they change earth’s crust constantly.

8 0

2 years ago

Which of the following behaviors allows a bird to maintain a constant body temperature in extremely hot weather?

patriot [66]

d. All of the above

These behaviors;

Spreading wings
Flattening feathers
panting

are all evolutionary process to maintain body temperature. Birds are warm-blooded animals. Also known as homeotherms, which is defined as having the constant body temperature. This is a vital function for the survival of the specie.

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c. are hollow

The bones of most birds are hollow in order for the weight of the birds to be light for them to fly.

8 0

3 years ago

What does the prefix "hetero-" mean? A. Same B. Different

disa [49]

I would say different
Like you like different genders

4 0

3 years ago

Read 2 more answers