19. CER. A group of students were interested in showing photosynthesis occurring visually. They decided to use bromothymol blue which is an
indicator that turns green when there is a high concentration of carbon
dioxide and blue when there is a low concentration of carbon dioxide in
water. All the tubes started out blue, but students blew carbon dioxide
into two of the test tubes turning them green. They left one test tube of
each color as their control and put a piece of aquatic plant in the other
two tubes. Then, they put all four of these tubes outside (Monday 7 am).
When the students checked their tubes in the afternoon (Monday 1 pm),
they were so excited to see that tube D had turned blue! Carbon dioxide
was going away and being replaced with oxygen. When the students
checked their experiment early the next morning, tube B and D had both
turned green! Did photosynthesis occur during the experiment? Support
your claim with evidence explain your reasoning. *

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

answer: a) a compound microscope has a greater magnification ability than a simple microscope.

explanation:

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

bru what tyep of qus is dis