BIOLOGY MIDDLE SCHOOL

What does a plant cell have that an animal cell doesn't have?

Answers

Answer 1
Answer: A plant cell has chloroplasts.
 An animal cells doesn't.
Answer 2
Answer: Chloroplasts. As an animal doesn't

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Please help??? Science SEMESTER REVIEW!!!!In a series of rock layers, a geologist finds fossils of a pine trees and oak trees in layers that are 1.0 m and 1.5 m deep. However, in a layer that is 2.0 m deep, he finds fossils of tropical plants and trees. Which explains his findings?

  A. The continent remained in the tropics.
  B. The continent shifted toward the tropics.
  C. The continent shifted toward the mid-latitudes and polar regions.
  D. The ancient climate remained hot.

Answers

it is b the continent shifted towards the tropics 

Why do we need energy?

Answers

because with out energy we wouldn't be moving and we would always be sleeping.
Plants use the light from the sun to grow. Animals and people eat the plants and use the energy that was stored. Food is fuel for our bodies' energy needs like muscle power. We also use our own bodies to make heat energy.

Name 3 sports activities that use aerobic respiration

Answers

Many sports require aerobic respiration, however, major sports that require high degrees of aerobic respiration include swimming, running, football, soccer, basketball, and others. 

Why is carbon important

Answers

Carbon is very important because Trees take it (Co2) in in order for oxygen to be produced.

All plants for the most part take in Co2 so that they can produce oxygen,
and we need that oxygen to live , to pump blood into our lungs so we can roam around.

It is basically one of the main components of our every day life on Earth.

I really hope this helps you a lot.
carbon forms the key component for all known life on earth.

PKU (Phenylketonuria) is an autosomal recessive disease, in which the synthesis of amino acid Tyrosine from Phenylalanine is blocked. As a result, an excess of Phenylalanine gets converted into phenylketones, which appear in the urine. In severe conditions it may also result in damage to the brain.The gene responsible for this is p, whereas the gene P is responsible for normal synthesis of Tyrosine. In a small population of Brazilian natives, the frequency of gene p, responsible for this disease, is 0.3. What must be the frequency of people who are heterozygous for this disease? ( p + q = 1, p2 + 2pq + q2 = 1) A.0.56
B.0.35
C.0.42

Answers

The answer is; C

Use the Hardy Weinberg equiation for population in assumed equilibrium. ( p+q = 1)

If p = 0.3 then q=1-p = 1-0.3 = 0.7

People who are heterozygous for the disease are represented by 2pq = 2 * 0.3 * 0.7

0.42


A change in the gene pool of a population form one generation to the next that does not necessarily result in speciation is an example of

Answers

Genetic Drift

Explanation:

Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance or sampling error.  Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.  This process may result in the loss of some alleles (including beneficial ones) and the fixation, or rise to 100% frequency, of other alleles.  It also have major effects when a population is sharply reduced in size by a natural disaster (bottleneck effect) or when a small group splits off from the main population to found a colony (founder effect).
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