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Verdich [7]
2 years ago
10

How many national parks are in the u.s

Biology
1 answer:
Brrunno [24]2 years ago
8 0

Answer:

the us has 63 national parks, which are congressionally-designated protected areas operated by National Park service, an agency of the department of the interior.

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Which compound plays a pivotal role in both the first and last step of the TCA cycle? a. pyruvate b. oxaloacetate c. oxalate d.
vitfil [10]

Answer:

Option b oxaloacetate is the right one.

Explanation:

There are major eight steps in TCA cycle. Oxaloacetate plays a pivotal role in <u>first and eight step</u>s of cycle.

Step 1. In the first step of the citric acid cycle, acetyl CoA joins with a four-carbon molecule, oxaloacetate, releasing the CoA group and forming a six-carbon molecule called citrate.

Step 8. In the last step of the citric acid cycle, oxaloacetate—the starting four-carbon compound-is regenerated by oxidation of malate. Another molecule of NAD+ is reduced to NADH in the process.

8 0
3 years ago
How does water move across a cell membrane?
blondinia [14]
At the same time, carbon dioxide molecules diffuse rapidly out of the red blood cells<span>, down their concentration gradient, and into your lungs. When </span>water<span> molecules </span>move <span>freely </span>across a cell membrane<span>, the process is called OSMOSIS , which is just a special type of simple diffusion.</span>
5 0
3 years ago
What words can you think of that have therm- as a prefix? From these words, what do
nlexa [21]
Words thermal, thermocouple, thermos, thermel. Therm is all about heat, it’s a unit of heat. Therm is a Greek word meaning heat such as thermometer hypothermia and many more
6 0
3 years ago
A scientist has discovered a new gene in oysters. Oysters with the dominant allele for disease resistance 'R' have been found to
ziro4ka [17]

the answer is B I believe

3 0
3 years ago
Read 2 more answers
Which of these processes happens randomly and which are not considered random? Artificial selection, natural selection, sexual s
Doss [256]

Answer:

Artificial selection is non-random whereas natural selection, and sexual selection are random selection.

Explanation:

Artificial selection is considered non-random whereas natural selection, and sexual selection are considered as random selection because in Artificial selection, humans select the mating animals in order to acquire the desired characteristics and features in the offspring while on the other hand, natural selection, and sexual selection are happen randomly without the intervention of humans, it occurs naturally so we can conclude that artificial selection is non-random whereas natural selection, and sexual selection are random selection.

5 0
3 years ago
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